Temperature sensor insensitive to device offsets with independent adjustment of slope and reference temperature
First Claim
1. 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 Assignments
0 Petitions
Accused Products
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.
-
Citations
18 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A temperature sensor that produces an indication of an operating temperature of the heat generating circuit, comprising:
-
a plurality of diodes that are thermodynamically coupled to heat generating circuitry, wherein the diodes produce a voltage based in part upon a temperature of the heat generating circuit; and
logic for determining a temperature based upon the indication wherein the logic generates a signal opposite to a common mode signal to sum with the common mode signal to produce a signal reflecting only a voltage drop change due to temperature change. - View Dependent Claims (13, 14, 15, 16)
-
-
17. A method for determining an operating temperature of the heat generating circuit, comprising:
-
conducting a first current through a first diode and a second current through a second diode;
determining a difference in voltage drops in the first and second diodes;
selectively inverting the difference in voltage drops;
amplifying the selectively inverted difference to produce an amplified difference;
selectively inverting the amplified difference to produce a selectively inverted amplified difference;
summing the selectively inverted amplified difference with the first voltage drop amplifying the sum of the selectively inverted amplified difference with the first voltage drop to produce an amplified sum;
determining a difference between the amplified sum and the selectively inverted difference to remove a common mode signal; and
setting gain levels of at least one amplifier to adjust a slope of an output voltage-temperature curve.
-
-
18. A method for determining an operating temperature of the heat generating circuit, comprising:
-
conducting a first current level through a semiconductor device that is thermodynamically coupled to a heat generating circuit;
detecting a first voltage drop across the semiconductor device;
conducting a second current level through the semiconductor device that is thermodynamically coupled to the heat generating circuit; and
detecting a second voltage drop across the semiconductor device;
removing a common mode signal from the first and second voltage drops and determining a temperature of the heat generating circuit.
-
Specification