US 7,120,393 B2 · Temperature sensor insensitive to device offsets with independent adjustment of slope and reference temperature

Abstract

A radio transceiver includes circuitry that enables received RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a temperature sensing module that produce accurate voltage level readings may be mapped into corresponding temperature values. A processor, among other actions, adjusts gain level settings based upon detected temperature values. One aspect of the present invention further includes repetitively inverting voltage signals across a pair of semiconductor devices beings used as temperature sensors to remove a common mode signal to produce an actual temperature-voltage curve. In one embodiment of the invention, the circuitry further includes a pair of amplifiers to facilitate setting a slope of the voltage-temperature curve.

Claims18

Dependent claims

A direct conversion Radio Frequency (RF) transceiver integrated circuit comprising:

a local oscillator that generates a RF local oscillation signal corresponding to a RF channel;
a receiver section operably coupled to the local oscillator that receives an incoming RF signal and down converts the incoming RF signal based upon the RF local oscillation signal to produce a baseband signal;
a transmitter section operably coupled to the local oscillator that receives an outgoing baseband signal and up converts the outgoing baseband signal to produce an outgoing RF signal;
and
wherein the transmitter section further comprises:
a heat generating circuit;
a temperature sensor that produces a voltage without a common mode component as an indication of an operating temperature of the heat generating circuit;
and
at least one adjustable gain element operably having a gain setting that is based upon the indication of the operating temperature provided by the temperature sensor.

6 more elements

Dependencies are inferred from the claim text.

Temperature sensor insensitive to device offsets with independent adjustment of slope and reference temperature

Life of this patent

Temperature sensor insensitive to device offsets with independent adjustment of slope and reference temperature

Life of this patent

Abstract

Claims18