Complex bandpass filter having a transfer function with two poles

摘要

In some implementations, a filter circuit includes a first signal path that includes a first amplifier and a second signal path that includes a second amplifier. The first signal path is configured to receive a first component of a complex signal and provide a filtered version of the first component of the complex signal. The second signal path is configured to receive a second component of the complex signal and provide a filtered version of the second component of the complex signal. The first signal path before the first amplifier is coupled to the second signal path before the second amplifier. The first signal path after the first amplifier is coupled to the second signal path before the second amplifier. The second signal path after the second amplifier is coupled to the first signal path before the first amplifier.

主权项

1. A circuit comprising:
a first signal path that includes a first amplifier, the first signal path configured to receive a first component of a complex signal and provide a filtered version of the first component of the complex signal; and a second signal path that includes a second amplifier, the second signal path configured to receive a second component of the complex signal and provide a filtered version of the second component of the complex signal, wherein the first signal path comprises a first capacitor branch coupled to the first amplifier, wherein the second signal path comprises a second capacitor branch coupled to the second amplifier, wherein the first signal path before the first capacitor branch is coupled to the second signal path before the second capacitor branch, wherein the first signal path after the first capacitor branch and before the first amplifier is coupled to the second signal path after the second capacitor branch and before the second amplifier, and wherein the first signal path after the first amplifier is coupled to the second signal path after the second capacitor branch and before the second amplifier, and the second signal path after the second amplifier is coupled to the first signal path after the first capacitor branch and before the first amplifier.