Abstract: Provided herein are apparatus and methods for transconductance amplifiers, such as split cascode low-noise transconductance amplifiers (LNTAs). In an embodiment, an LNTA includes split current paths each coupled to a different mixer by way of a different alternating current (AC) coupling capacitor. The split current paths of the LNTA can be enabled during different modes of operation, such as when the input to the LNTA is within different frequency bands.

Abstract: Provided herein are apparatus and methods for transconductance amplifiers, such as split cascode low-noise transconductance amplifiers (LNTAs). In an embodiment, an LNTA includes split current paths each coupled to a different mixer by way of a different alternating current (AC) coupling capacitor. The split current paths of the LNTA can be enabled during different modes of operation, such as when the input to the LNTA is within different frequency bands.

Abstract: An LIF receiver includes a receiver path comprising: a mixer for mixing a received RF signal with a local oscillator signal to provide an IF signal at a lower frequency than the received RF signal, a bandpass filter for filtering the IF signal, a PGA for amplifying the filtered IF signal, an ADC for converting the amplified filtered IF signal to a digital signal, a converter for converting the digital signal to a baseband digital signal, and an AGC for setting a gain of the PGA in response to a magnitude of the received RF signal. A programmable DC signal source injects a programmed DC offset signal into the amplified filtered IF signal converted by the ADC, and a signal sensor, operatively connected to the receiver path after the PGA, determines a polarity of PGA signal output for a programmed DC offset signal. A controller determines a programmed DC offset signal minimizing a magnitude of the baseband signal in the absence of a received RF signal for at least one gain setting of the PGA.

Abstract: An LIF receiver includes a receiver path comprising: a mixer for mixing a received RF signal with a local oscillator signal to provide an IF signal at a lower frequency than the received RF signal, a bandpass filter for filtering the IF signal, a PGA for amplifying the filtered IF signal, an ADC for converting the amplified filtered IF signal to a digital signal, a converter for converting the digital signal to a baseband digital signal, and an AGC for setting a gain of the PGA in response to a magnitude of the received RF signal. A programmable DC signal source injects a programmed DC offset signal into the amplified filtered IF signal converted by the ADC, and a signal sensor, operatively connected to the receiver path after the PGA, determines a polarity of PGA signal output for a programmed DC offset signal. A controller determines a programmed DC offset signal minimizing a magnitude of the baseband signal in the absence of a received RF signal for at least one gain setting of the PGA.