Patent ID: 7034579

Claim:
A signal level detector comprising: a first DC error amplifier operational to generate a output signal in response to a reference signal and a feedback signal; and a first inverter operational to generate the feedback signal in response to the first DC error amplifier output signal, wherein the first DC error amplifier control signal operates to set a switching point for the first inverter; a second DC error amplifier; a second inverter, wherein the first and second DC error amplifiers and the first and second inverters together implement a differential comparator generating a desired output signal in response to a differential input signal determined via the switching point associated with the first inverter and a switching point associated with the second inverter and a signal inverter coupled to the first DC error amplifier output signal to set a switching point for the signal inverter, the signal inverter operating as an open loop signal level detector; wherein an input signal is coupled to the signal inverter for detecting a signal level of the input signal.