Blocking capacitor compensation system suitable for zero intermediate frequency receiver
The invention discloses a blocking capacitance compensation system suitable for a zero intermediate frequency receiver. The blocking capacitance compensation system comprises a first chopping operational amplifier module, a second chopping operational amplifier module, an operational amplifier and a...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention discloses a blocking capacitance compensation system suitable for a zero intermediate frequency receiver. The blocking capacitance compensation system comprises a first chopping operational amplifier module, a second chopping operational amplifier module, an operational amplifier and a switched capacitor integrator. According to the invention, signals are chopped and amplified twice through the first chopping operational amplifier module and the second chopping operational amplifier module, and offset voltage and flicker noise of an operational amplifier can be chopped once, so that the signals are separated from direct-current offset and flicker noise of the operational amplifier, the offset and the noise are filtered out, and the original signals are not influenced; meanwhile, low-pass filtering with the bandwidth being only 10 Hz is achieved through the switched capacitor integrator, direct-current signals are choked through negative feedback of the switched capacitor integrator, and the comp |
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