Patent ID: 11183979

Abstract:
The invention relates to a gain-control stage (100) for generating gain-control signals (Vc+, Vc−) for controlling an external variable-gain amplifying unit (101). The gain-control stage comprises a first (102) and a second differential amplifier unit (112) that receive, at a respective input interface (104,114) a reference voltage signal (VRef) and a variable gain-control voltage signal (VGC). The second differential amplifier unit is configured to provide, via a second output interface (120), a control voltage signal (V1) to a controllable first current source (106) of the first differential amplifier unit (102). The first differential amplifier unit (102) is configured to provide, via a first output interface (110), the first and the second gain-control signal (VC+, VC−) in dependence on the variable gain-control voltage signal (VGC), the reference voltage signal (VRef) and a first biasing current (IB1) that depends on the control voltage signal.