Patent ID: 6498926
Filing Date: 2002-12-24
Classification: H03F,H03G,H04B

Abstract:
A programmable linear receiver comprising:(a) an adjustable gain element for receiving an RF signal, the adjustable gain element having a gain control input; (b) at least one amplifier stage which: (i) is connected to the adjustable gain element, and (ii) has a variable IIP3 operating point adjustable by a bias control input; (c) a demodulator which: (i) is connected to the amplifier, and (ii) provides baseband data; (d) a non-linearity measurement circuit which: (i) is connected to the demodulator, and (ii) either: (1) measures the RSSI slope, or (2) computes a change in the energy-per-chip-to-noise ratio (Ec/Io) versus a change in a level of the RF signal; (e) a bias control circuit which is connected to: (i) the non-linearity measurement circuit, and (ii) the bias control input of the amplifier stage having a variable IIP3 operating point; and (f) a gain control circuit connected to the gain control input of the adjustable gain element.