PROGRAMMABLE GAIN AMPLIFIER, INTEGRATED CIRCUIT, ELECTRONIC DEVICE, AND FREQUENCY CORRECTION METHOD
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United States of America Patent
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Issued Date -
Jul 18, 2024
app pub date -
Mar 8, 2024
filing date -
Jul 8, 2021
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Abstract
A programmable gain amplifier includes a first-stage operational transconductance amplifier (OTA), a second-stage OTA, a capacitor module, a clock oscillation circuit, and a correction circuit. An input terminal of the second-stage OTA is connected to an output terminal of the first-stage OTA. The capacitor module is connected between the output terminal of the first-stage OTA and an output terminal of the second-stage OTA. The clock oscillation circuit is connected to the output terminal of the first-stage OTA and the capacitor module, and is configured to perform charging and discharging of the capacitor module by an output current from the first-stage OTA to output a clock signal. The correction circuit is connected to the clock oscillation circuit and the capacitor module to adjust a capacitance of the capacitor module so that a clock frequency of the clock signal is consistent with a preset clock frequency.
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