阅读说明：本技术 一种应用于数字对讲机的宽带压控振荡器 (A kind of wideband voltage controlled oscillator applied to digital walkie-talkie ) 是由 王远 王晓强 杨腾腾 王立强 武泽东 于 2019-09-24 设计创作，主要内容包括：本发明公开了一种应用于数字对讲机的宽带压控振荡器。本设计包括第一选通控制电路、第二选通控制电路、第一LC谐振电路、第二LC谐振电路及振荡放大电路。本设计通过对两个LC谐振电路的选通控制,VCO实现了80MHz的工作带宽,比通常的单LC谐振电路的VCO的工作频率带宽提高了一倍。还可以通过增加LC谐振电路和选通控制接口进而实现工作频率带宽的进一步增加。(The invention discloses a kind of wideband voltage controlled oscillators applied to digital walkie-talkie.The design includes the first gate control circuit, the second gate control circuit, the first LC resonance circuit, the second LC resonance circuit and oscillator-amplification circuit.The design is controlled by the gating to two LC resonance circuits, and VCO realizes the bandwidth of operation of 80MHz, and the operational frequency bandwidth than the VCO of common single LC resonance circuit is doubled.Further increasing for operational frequency bandwidth can also be realized by increasing LC resonance circuit and gating control interface.)

1. a kind of wideband voltage controlled oscillator applied to digital walkie-talkie, which is characterized in that including the first gate control circuit, Two gate control circuits, the first LC resonance circuit, the second LC resonance circuit and oscillator-amplification circuit,

First gate control circuit includes resistance R2, inductance L3 and switch PIN pipe D9；The second gating control electricity Road includes resistance R1, inductance L4 and switch PIN pipe D10；The first LC resonance circuit includes inductance L1, two pole of variable capacitance Pipe D1, varicap D3, varicap D7, varicap D8, capacitor C1, inductance L5, inductance L7 With capacitor C4；The second LC resonance circuit include inductance L2, varicap D2, varicap D4, can Variable capacitance diode D5, varicap D6, capacitor C2, inductance L6, inductance L8 and capacitor C3；Electricity is amplified in the oscillation Road includes capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, resistance R3, resistance R4, resistance R5, inductance L9, inductance L10, inductance L11 and triode Q1；

The other end of termination a control interface SW1, resistance R2 of the resistance R2 of first gate control circuit connects inductance L3 One end, the anode of the other end connection switch PIN pipe D9 of inductance L3, switch PIN pipe D9 cathode ground connection；

The other end of termination a control interface SW2, resistance R1 of the resistance R1 of second gate control circuit connects inductance L4 One end, the anode of the other end connection switch PIN pipe D10 of inductance L4, switch PIN pipe D10 cathode ground connection；

The other end of termination tuning an interface VT, inductance L1 of the inductance L1 of the first LC resonance circuit connects variable capacitance two The cathode of pole pipe D1, the cathode of varicap D3, varicap D7 cathode and varicap D8 Cathode, varicap D1 anode and varicap D3 anode be grounded respectively, varicap The anode of D7 is connected with the anode of varicap D8, while connecting one end of capacitor C1 and one end of inductance L5 again, The other end of inductance L5 is grounded, one end of other end connection inductance L7, one end of capacitor C4 and the switch PIN of capacitor C1 The anode of pipe D9, the other end of inductance L7 and the other end of capacitor C4 are grounded respectively；

A termination tuning interface VT and the inductance with the first LC resonance circuit of the inductance L2 of the second LC resonance circuit The one end L1 is connected, the cathode of the other end of inductance L2 connection varicap D2, varicap D4 cathode, The cathode of varicap D5 and the cathode of varicap D6, varicap D2 anode and can power transformation The anode for holding diode D4 is grounded respectively, and the anode of varicap D5 is connected with the anode of varicap D6 It connects, while connecting one end of capacitor C2 and one end of inductance L6, one end of the other end connection inductance L8 of capacitor C2, capacitor C3 again One end and the switch PIN pipe D10 anode, the other end of inductance L6, the other end of inductance L8 and capacitor C3 it is another End is grounded respectively；

The switch PIN pipe D10 of the switch PIN pipe D9 anode of first gate control circuit and the first gate control circuit is just Pole passes through coupled capacitor C5 respectively, coupled capacitor C6 connects one end of one end capacitor C8 of the oscillator-amplification circuit, inductance L9 With the base stage of triode Q1, one end of the other end connection capacitor C9 of capacitor C8 and one end of capacitor C10, capacitor C10's is another One end of end connection resistance R4 and the emitter of triode Q1, one end of the other end connection inductance L10 of resistance R4, inductance L9's The other end connects one end of resistance R3 and one end of capacitor C7, other end connection one end of resistance R5 of resistance R3, capacitor C11 The one of the other end of one end and one end of inductance L11, while connecing+5V power supply, the other end of resistance R5 and inductance L11, capacitor C12 The collector of end and triode Q1 are connected, and the other end of capacitor C12 is the output end of oscillator-amplification circuit, and capacitor C7's is another One end, the other end of capacitor C9, the other end of capacitor C11 and inductance L10 the other end be grounded respectively.

Technical field

The present invention relates to the communications fields, more particularly to a kind of wideband voltage controlled oscillator applied to digital walkie-talkie (VCO).

Background technique

Currently, it is existing and once some be applied to digital intercom machine equipment in VCO generally by LC resonance circuit, oscillation amplify The composition such as device realizes the oscillator of various frequencies by the parameter value of component in design circuit.But existing VCO is single Resonant circuit forms, have that operational frequency bandwidth is relatively narrow, are not able to satisfy the digital walkie-talkie of wider operational frequency bandwidth Application demand.

Summary of the invention

In order to solve the above technical problems, the present invention provides a kind of wideband voltage controlled oscillator applied to digital walkie-talkie.This The LC resonance circuit in parallel of multiple and different frequency ranges is connected to a shared monofier by coupled capacitor by design, is led to It crosses gate control circuit and selects corresponding LC resonance circuit, to realize that operational frequency bandwidth is doubled and redoubled.

The technical scheme adopted by the invention is that: a kind of wideband voltage controlled oscillator applied to digital walkie-talkie, feature It is, including the first gate control circuit, the second gate control circuit, the first LC resonance circuit, the second LC resonance circuit and vibration Amplifying circuit is swung, first gate control circuit includes resistance R2, inductance L3 and switch PIN pipe D9；Second choosing Logical control circuit includes resistance R1, inductance L4 and switch PIN pipe D10；The first LC resonance circuit includes inductance L1, can be changed Di-cap D1, varicap D3, varicap D7, varicap D8, capacitor C1, inductance L5, inductance L7 and capacitor C4；The second LC resonance circuit includes inductance L2, varicap D2, variable capacitance two Pole pipe D4, varicap D5, varicap D6, capacitor C2, inductance L6, inductance L8 and capacitor C3；Described Oscillator-amplification circuit includes capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, resistance R3, resistance R4, electricity Hinder R5, inductance L9, inductance L10, inductance L11 and triode Q1.

The other end of termination a control interface SW1, resistance R2 of the resistance R2 of first gate control circuit connects electricity Feel one end of L3, the anode of the other end connection switch PIN pipe D9 of inductance L3, the cathode ground connection of switch PIN pipe D9.

The other end of termination a control interface SW2, resistance R1 of the resistance R1 of second gate control circuit connects electricity Feel one end of L4, the anode of the other end connection switch PIN pipe D10 of inductance L4, the cathode ground connection of switch PIN pipe D10.

The other end connection of termination tuning an interface VT, inductance L1 of the inductance L1 of the first LC resonance circuit can power transformation Hold the cathode of diode D1, two pole of the cathode of varicap D3, the cathode of varicap D7 and variable capacitance The cathode of pipe D8, the anode of varicap D1 and the anode of varicap D3 are grounded respectively, variable capacitance two Pole pipe D7 anode be connected with the anode of varicap D8, while again connection capacitor C1 one end and inductance L5 one End, the other end ground connection of inductance L5, one end of other end connection inductance L7, one end of capacitor C4 and the switch of capacitor C1 The anode of PIN pipe D9, the other end of inductance L7 and the other end of capacitor C4 are grounded respectively.

The inductance L2 of the second LC resonance circuit one termination tuning interface VT and with the first LC resonance circuit The one end inductance L1 is connected, the cathode of the other end of inductance L2 connection varicap D2, varicap D4 The cathode of cathode, the cathode of varicap D5 and varicap D6, varicap D2 anode and The anode of varicap D4 is grounded respectively, the anode of the anode and varicap D6 of varicap D5 It is connected, while connects one end of capacitor C2 and one end of inductance L6, one end of the other end connection inductance L8 of capacitor C2, electricity again Hold one end of C3 and the anode of the switch PIN pipe D10, the other end of inductance L6, the other end of inductance L8 and capacitor C3 The other end is grounded respectively；

The switch PIN pipe D10 of the switch PIN pipe D9 anode of first gate control circuit and the first gate control circuit is just Pole passes through coupled capacitor C5 respectively, coupled capacitor C6 connects one end of one end capacitor C8 of the oscillator-amplification circuit, inductance L9 With the base stage of triode Q1, one end of the other end connection capacitor C9 of capacitor C8 and one end of capacitor C10, capacitor C10's is another One end of end connection resistance R4 and the emitter of triode Q1, one end of the other end connection inductance L10 of resistance R4, inductance L9's The other end connects one end of resistance R3 and one end of capacitor C7, other end connection one end of resistance R5 of resistance R3, capacitor C11 The one of the other end of one end and one end of inductance L11, while connecing+5V power supply, the other end of resistance R5 and inductance L11, capacitor C12 The collector of end and triode Q1 are connected, and the other end of capacitor C12 is the output end of oscillator-amplification circuit, and capacitor C7's is another One end, the other end of capacitor C9, the other end of capacitor C11 and inductance L10 the other end be grounded respectively.

The beneficial effects of the present invention are: being controlled by the gating to two LC resonance circuits, VCO realizes the work of 80MHz Make bandwidth, the operational frequency bandwidth than the VCO of common single LC resonance circuit is doubled.It can also be by increasing LC resonance Circuit and gating control interface realize further increasing for operational frequency bandwidth in turn.

Detailed description of the invention

Fig. 1 is electrical schematic diagram of the invention.

Specific embodiment

Below in conjunction with attached drawing, the invention will be further described:

As shown in Figure 1, the design includes the first gate control circuit, the second gate control circuit, the first LC resonance circuit, second LC resonance circuit and oscillator-amplification circuit, the first gate control circuit include resistance R2, inductance L3 and switch PIN pipe D9；Second Gate control circuit includes resistance R1, inductance L4 and switch PIN pipe D10；First LC resonance circuit includes inductance L1, variable capacitance Diode D1, varicap D3, varicap D7, varicap D8, capacitor C1, inductance L5, electricity Feel L7 and capacitor C4；Second LC resonance circuit includes inductance L2, varicap D2, varicap D4, can be changed Di-cap D5, varicap D6, capacitor C2, inductance L6, inductance L8 and capacitor C3；Oscillator-amplification circuit includes electricity Hold C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, resistance R3, resistance R4, resistance R5, inductance L9, inductance L10, inductance L11 and triode Q1.

The other end of termination a control interface SW1, resistance R2 of the resistance R2 of the first gate control circuit of the design connects Connect one end of inductance L3, the anode of the other end connection switch PIN pipe D9 of inductance L3, the cathode ground connection of switch PIN pipe D9.

The other end of termination a control interface SW2, resistance R1 of the resistance R1 of the second gate control circuit of the design connects Connect one end of inductance L4, the anode of the other end connection switch PIN pipe D10 of inductance L4, the cathode ground connection of switch PIN pipe D10.

The other end connection of termination tuning an interface VT, inductance L1 of the inductance L1 of the first LC resonance circuit of the design can The cathode of variable capacitance diode D1, the cathode of varicap D3, varicap D7 cathode and variable capacitance The cathode of diode D8, the anode of varicap D1 and the anode of varicap D3 are grounded respectively, can power transformation The anode for holding diode D7 is connected with the anode of varicap D8, while connecting one end and the inductance L5 of capacitor C1 again One end, the other end ground connection of inductance L5, other end connection one end of inductance L7 of capacitor C1, one end of capacitor C4 and switch The anode of PIN pipe D9, the other end of inductance L7 and the other end of capacitor C4 are grounded respectively.

The inductance L2 of the second LC resonance circuit of the design one termination tuning interface VT and with the first LC resonance circuit The one end inductance L1 is connected, the cathode of the other end of inductance L2 connection varicap D2, varicap D4 The cathode of cathode, the cathode of varicap D5 and varicap D6, varicap D2 anode and The anode of varicap D4 is grounded respectively, the anode of the anode and varicap D6 of varicap D5 It is connected, while connects one end of capacitor C2 and one end of inductance L6, one end of the other end connection inductance L8 of capacitor C2, electricity again Hold one end of C3 and the anode of switch PIN pipe D10, the other end of inductance L6, the other end of inductance L8 and capacitor C3 it is another End is grounded respectively.

The switch PIN pipe D9 anode of the first gate control circuit of the design and the switch of the first gate control circuit PIN pipe D10 anode passes through coupled capacitor C5, one end capacitor C8 of coupled capacitor C6 connection oscillator-amplification circuit, inductance L9 respectively One end and triode Q1 base stage, capacitor C8 the other end connection capacitor C9 one end and capacitor C10 one end, capacitor C10 The other end connection resistance R4 one end and triode Q1 emitter, resistance R4 the other end connection inductance L10 one end, electricity Feel one end of the other end connection resistance R3 of L9 and one end of capacitor C7, one end of the other end connection resistance R5 of resistance R3, electricity Hold one end of C11 and one end of inductance L11, while connecing+5V power supply, the other end of resistance R5 and the other end, the capacitor of inductance L11 One end of C12 and the collector of triode Q1 are connected, and the other end of capacitor C12 is the output end of oscillator-amplification circuit, electricity The other end for holding the other end of C7, the other end of capacitor C9, the other end of capacitor C11 and inductance L10 is grounded respectively.

Design principle of the invention: when tuning interface VT input voltage range 1V~4V, the vibration of the first LC resonance circuit Frequency range meets 400MHz~440MHz, when tuning interface VT input voltage range 1V~4V, the vibration frequency of LC resonance circuit 2 Rate range meets 440MHz~480MHz.When control interface SW1 input low level and control interface SW2 input high level, open PIN pipe D9 cut-off, switch PIN pipe D10 conducting are closed, so that the second LC resonance circuit is short-circuited to ground, the first LC resonance circuit is logical Overcoupling capacitor C5 is connected to oscillator-amplification circuit, forms VCO circuit, and tuning operating frequency range is 400MHz~440MHz. When control interface SW2 input low level and control interface SW1 input high level, switch PIN pipe D10 cut-off, switch PIN pipe D9 Conducting, so that the first LC resonance circuit is short-circuited to ground, the second LC resonance circuit is connected to oscillation amplification by coupled capacitor C6 Circuit, forms VCO circuit, and tuning operating frequency range is 440MHz~480MHz.