Patent ID: 6717461
Filing Date: 2004-04-06
Classification: H03F,H03H

Abstract:
A combined filter, comprising:a first filter having: a first filter configuration, a first bias input for receiving a first bias, a first input for receiving a first input signal, and a first output for providing a first output signal; a second filter having: a second filter configuration, a second bias input for receiving a second bias, a second input for receiving a second input signal, and a second output for providing a second output signal, the second filter configuration matching the first filter configuration, the first bias and the second bias being adjusted in accordance with at least one amplitude of at least one of the first input signal and the second input signal, and the first bias and the second bias being adjusted to be approximately equal; and a combined filter output configured to provide a combined output signal comprising a difference of the first output signal and the second output signal.