Amplifier structures that enhance transient currents and signal swing
AssigneeAnalog Devices, Inc.
InventorsFranklin M. Murden, Ege Yetis
Life of this patent
Estimating the term…
Abstract
Amplifier embodiments are provided that are well suited for systems which require high signal gains and high transient currents that can drive various loads (e.g., capacitive loads). At least one amplifier embodiment is realized with a cascoded complementary differential input stage, a complementary differential output stage, and a bias controller. The output stage includes lower and upper differential pairs of transistors that respectively have lower and upper coupled back gates and the bias controller is configured to provide bias voltages for the lower and upper coupled back gates.
Claims26
An amplifier for processing a differential input signal into a differential output signal, comprising:
- a cascoded complementary differential input stage coupled to generate an intermediate signal in response to said input signal:
- and
- a complementary differential output stage arranged between lower and upper ports with one of said lower and upper ports coupled to ground wherein said output stage is coupled to provide said output signal in response to said intermediate signal;
- wherein said output stage includes lower and upper differential pairs of transistors which respectively have lower and upper coupled back gates and further including a bias controller that is configured to provide bias voltages for said lower and upper coupled back gates.
An amplifier for processing a differential input signal into a differential output signal, comprising:
- a cascoded complementary differential input stage coupled to generate an intermediate signal in response to said input signal;
- and
- a complementary differential output stage coupled to provide said output signal in response to said intermediate signal wherein said output stage includes lower and upper differential pairs of transistors which respectively have lower and upper coupled back gates;
- and
- a bias controller that is configured to provide bias voltages for said lower and upper coupled back gates.
A signal converter system that converts analog input signals to corresponding digital signals, comprising:
- a sampler that provides samples of said input signal;
- successive converter stages that, for each sample of said samples, provide successive digital estimates of said sample and generate a corresponding residue signal;
- a multiplying digital-to-analog converter in each of said converters that is configured to generate said residue signal with aid of a residue amplifier;
- and
- an aligner/corrector that provides said corresponding digital signals in response to said successive digital estimates;
- wherein said residue amplifier processes a differential input signal into a differential output signal and includes:
- a cascoded complementary differential input stage coupled to generate an intermediate signal in response to said input signal;
- and
- a complementary differential output stage arranged between lower and upper ports with one of said lower and upper ports coupled to ground wherein said output stage is coupled to provide said output signal in response to said intermediate signal;
- and wherein said output stage includes lower and upper differential pairs of transistors which respectively have lower and upper coupled back gates and further including a bias controller that is configured to provide bias voltages for said lower and upper coupled back gates.
An amplifier to amplify an input signal into an output signal with controlled bias, comprising:
- a transistor arranged to process said input signal into said output signal and having a transistor backgate;
- a diode-coupled transistor having a control backgate coupled to said transistor backgate;
- and
- a differential amplifier arranged to drive said control backgate to substantially match voltage across said diode-coupled transistor to a reference voltage.
Dependencies are inferred from the claim text.