Patent ID: 6137361
Filing Date: 2000-10-24
Classification: H03F

Abstract:
An apparatus including a low power class A amplifier circuit, comprising:a load circuit terminal configured to convey a variable source current, convey a substantially constant sink current, be coupled to a load circuit and convey a load current for said load circuit;an input amplifier circuit configured to provide an internal signal and to receive an input signal and in accordance therewith provide an amplified signal;a current sink circuit, coupled between said input amplifier circuit and said load circuit terminal, configured to receive said amplified signal and in accordance therewith conduct said substantially constant sink current;a current source circuit, coupled to said load circuit terminal, configured to receive a control signal and in accordance therewith provide said variable source current, wherein said current source circuit comprises a current mirror circuit which includesan input circuit configured to receive said control signal and in accordance therewith generate a control current, andan output circuit, coupled to said input circuit, configured to receive said control current and in accordance therewith provide said variable source current; anda control circuit, coupled between said input amplifier circuit and said current source circuit, configured to receive said internal signal and said amplified signal and in accordance therewith provide said control signal.