Abstract
A low-power high-linearity PGA (Programmable Gain Amplifier) is proposed in this paper. The PGA adopts a differential degeneration structure to vary voltage gain and uses the closed-loop structure including the input op-amps to enhance the linearity. This PGA is fabricated in TSMC 0.13um CMOS technology. The measurements show that the PGA provides 64dB (3dB∼66dB) gain range with a step of 1dB, the bandwidth of the multi-stage PGA is higher than 20MHz. The IIP3 (third order input referred intercept point) of the PGA is measured to be as high as 20dBm at the minimum gain, meanwhile the NF is 28dB when the PGA gain at 34dB settings. The PGA chain consumes 7mA (I path) from 3.3V single supply voltage.
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