阅读说明：本技术 用于窄带物联网设备的温度稳定振荡器电路 (Temperature-stabilized oscillator circuit for narrow-band Internet of things equipment ) 是由 安德鲁·布里 于 2019-11-12 设计创作，主要内容包括：本发明涉及一种用于窄带物联网设备的无线电收发器的温度稳定振荡器电路,包括：晶体振荡器(XO),用于提供用于操作窄带物联网设备的时钟；锁相环(PLL)合成器,用于将由晶体振荡器提供的时钟倍增,以馈送发射路径中的上混频器和接收路径中的下混频器；以及频率偏移估计单元,用于估计晶体振荡器的时钟与从基站接收的信号之间的频率偏移。寻求使用廉价时钟源来降低窄带物联网设备的物料账单的可能性的目标将在其中得以解决,该廉价时钟源能够以恒定的时钟频率可靠地支持宽温度范围,其中晶体振荡器包括用于生成时钟的晶体,并且包括与晶体紧密良好热耦合放置的二极管,以用于通过测量二极管的电压来监控晶体的温度,而成对的所测量的电压和所估计的频率偏移被提供给温度补偿学习算法以选择正确的锁相环频率比,以用于控制和设置锁相环合成器的频率。(The invention relates to a temperature stable oscillator circuit of a radio transceiver for narrowband Internet of things equipment, which comprises: a crystal oscillator (XO) for providing a clock for operating the narrowband Internet of things device; a Phase Locked Loop (PLL) synthesizer for multiplying a clock provided by a crystal oscillator to feed an up-mixer in a transmit path and a down-mixer in a receive path; and a frequency offset estimation unit for estimating a frequency offset between a clock of the crystal oscillator and a signal received from the base station. The goal of seeking to reduce the possibility of material billing for narrowband internet of things devices using an inexpensive clock source that can reliably support a wide temperature range at a constant clock frequency is addressed, wherein the crystal oscillator comprises a crystal for generating the clock and comprises a diode placed in close good thermal coupling with the crystal for monitoring the temperature of the crystal by measuring the voltage of the diode, while the paired measured voltage and estimated frequency offset are provided to a temperature compensated learning algorithm to select the correct phase locked loop frequency ratio for controlling and setting the frequency of the phase locked loop synthesizer.)

1. A temperature stable oscillator circuit (1) for a radio transceiver of a narrowband internet of things device, the radio transceiver comprising: a receiving path (2) for converting a received analog radio frequency signal into a digital baseband signal; a transmission path (3) for converting the digital BB signal into a transmitted analog RF signal; a crystal oscillator (4) for providing a clock to operate the narrowband internet of things device; -a phase locked loop synthesizer (5) for multiplying the clock provided by the crystal oscillator (4) to feed an up-mixer (6) in the transmit path (3) and a down-mixer (7) in the receive path (2); and a frequency offset estimation unit (9) for estimating a frequency offset between the clock of the crystal oscillator (4) and a signal received from a base station (18), wherein the crystal oscillator (4) comprises a crystal (10) for generating the clock and comprises a diode (12) placed in close good thermal coupling with the crystal (10) for monitoring the temperature of the crystal (10) by measuring the voltage of the diode (12), the paired measured voltage and estimated frequency offset being provided to a temperature compensated learning algorithm for selecting a correct phase locked loop frequency ratio for controlling and setting the frequency of the phase locked loop synthesizer (5).

2. The temperature stable oscillator circuit (1) of claim 1, wherein a signal received from the base station (18) is used as a reference for the clock generated by the crystal oscillator (4) for operating the narrowband internet of things device.

3. The temperature stable oscillator circuit (1) as defined in claim 1, wherein the diode (12) is fed forward biased with a constant current (11).

4. The temperature stable oscillator circuit (1) of claim 1, wherein the diode (12) is operated with a resistor and a constant voltage source connected in series.

5. The temperature stable oscillator circuit (1) of one of the preceding claims, wherein the voltage of the diode (12) is fed into an analog to digital converter (13).

6. Temperature stable oscillator circuit (1) according to one of the preceding claims, wherein the pairs of measured voltages and estimated frequency offsets are recorded to compensate for temperature dependence of the crystal frequency and long term changes of the crystal frequency due to aging.

7. The temperature stable oscillator circuit (1) of one of the preceding claims, wherein the voltage of the diode (12) is measured periodically.

8. Temperature stable oscillator circuit (1) according to one of the preceding claims, wherein the crystal (10) and the diode (12) are formed as far away from the heating body as possible.

9. The temperature-stabilized oscillator circuit (1) of one of the preceding claims, wherein thermal isolation is formed between the crystal (10), the diode (12) and a substrate (16), the crystal (10) and the diode (12) being mounted on the substrate (16).

10. The temperature stable oscillator circuit (1) of claim 1, wherein the temperature of the crystal (10) is monitored by a bipolar transistor.

11. The temperature stable oscillator circuit according to claim 1, wherein a separate phase locked loop synthesizer (5) is formed to feed the up-mixer (6) in the transmit path (3) and the down-mixer (7) in the receive path (2).