下圖中的晶振電路將限幅正弦波波形轉(zhuǎn)換為CMOS波形.CMOS逆變器選擇必須根據(jù)工作頻率進(jìn)行評(píng)級(jí).通過(guò)正確選擇逆變器,該電路可以工作在100MHz.
該電路為TCXO溫補(bǔ)晶振提供恒定負(fù)載,因?yàn)樗cCMOS逆變器的輸出隔離.由R1,R2和C2組成的反饋網(wǎng)絡(luò)可以用單個(gè)1兆歐姆的電阻代替,但TCXO將由CMOS逆變器的輸出傳輸拉動(dòng).

The above circuit converts a clipped sinewave waveform to a CMOS waveform. The CMOS inverter selection must be rated for the frequency of operation. This circuit can work up to 100 MHz with proper selection of the inverter.
This circuit presents a constant load to the TCXO since it is isolated from the output of the CMOS inverter. The feedback network consisting of R1, R2 and C2 can be replaced with a single 1 Meg ohm resistor, however, the TCXO will be pulled by the output transitions of the CMOS inverter.

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