PGAProgrammable Gain Amplifier suitable for high linearity and low power

摘要

The present invention combines a current steering mirror stage with a digital-to-analog converter (DAC) stage to improve the nonlinearity generated at the PGA and transconductor stages of the mixer, To provide a variable gain amplifier suitable for low power operation by adjusting the current ratio of the steering mirror stage to amplify a signal and an RF transmitter using the same, a digital-to-analog converter for converting and transmitting a digital signal into an analog signal A current steering mirror using a DAC and at least two transistors, and adjusting a magnitude of an analog signal output from the DAC by adjusting a current ratio of the implemented current mirror stage. A mixer for generating a signal amplified by the current steering mirror stage as a specific frequency signal; May consists of, including: (PA Power Amplifier): (DA Drive Amplifier) or the power amplifier to a specific frequency generated by the mixer from the antenna driving amplifier for amplifying the power and the gain needed for transmission to the outside.