Back to results
US 2013/0171949 A1Published application
Apparatus and method for gain of driver amplifier exponential variable in wireless transmitter
AssigneeSamsung Electronics Co., Ltd.
InventorJong-Woo LEE
Life of this patent
Estimating the term…
Abstract
An apparatus and a method for exponentially controlling a gain of a driver amplifier to drive a power amplifier are provided. The driver amplifier includes a plurality of cascode amplifier segments, wherein when a plurality of candidate gain values of the driver amplifier is arranged, the candidate gain values form a geometric sequence. A unit cost can be reduced by halving an area occupied by the driver amplifier.
Claims12
A driver amplifier, the amplifier comprising:
- a plurality of cascode amplifier segments,
- wherein, when a plurality of candidate gain values of the driver amplifier is arranged, the candidate gain values form a geometric sequence.
A transmitter comprising:
- a Digital to Analog Converter (DAC) for converting a digital signal to an analog signal;
- a Low Pass Filter (LPF) for removing a high frequency noise from an analog output signal of the DAC and filtering only a low frequency signal;
- a mixer for converting the filtered analog signal to a transmit carrier frequency;
- a driver amplifier for controlling a gain of the converted analog signal;
- and
- a power amplifier for power-amplifying the analog signal of which the gain is controlled by the driver amplifier,
- wherein the driver amplifier comprises a plurality of cascode amplifier segments, and
- wherein, when a plurality of candidate gain values of the driver amplifier is arranged, the candidate gain values form a geometric sequence.
5 more elements
Dependencies are inferred from the claim text.