Patent ID: 7583947

Claim:
A method for reducing interference in a signal, the method comprising: downconverting a global system for mobile communications (GSM) signal from a radio frequency (RF) signal to a very low intermediate frequency (VLIF) signal; amplifying the VLIF signal using at least a first amplifier, a second amplifier and a third amplifier, the first amplifier being a first programmable amplifier of a programmable bandpass filter, the second amplifier being a second programmable amplifier, the third amplifier being a fixed amplifier; mixing a first input signal that is derived from the amplified VLIF signal with a first local oscillator signal to generate a first mixed signal, the first input signal comprising at least a first VLIF signal, the first local oscillator signal having a selectable frequency; mixing a second input signal that is derived from the amplified VLIF signal with a second local oscillator signal to generate a second mixed signal, the second input signal comprising at least a second VLIF signal; adding said first mixed signal and said second mixed signal to generate a first mixed output signal, which is a first analog single sideband baseband signal; mixing said first input signal with said second local oscillator signal to generate a third mixed signal; mixing said second input signal with said first local oscillator signal to generate a fourth mixed signal; and subtracting said third mixed signal from said fourth mixed signal to generate a second mixed output signal, which is a second analog single sideband baseband signal.