Patent ID: 7620371
Filing Date: 2009-11-17
Classification: H04B,H04L

Abstract:
1. A Radio Frequency (RF) transceiver integrated circuit comprising: a local oscillator that generates an RF local oscillation signal corresponding to an RF channel; a receiver section operably coupled to the local oscillator to receive the RF local oscillation signal, wherein the receiver section receives an incoming RF signal, and wherein the receiver section down-converts the incoming RF signal based upon the RF local oscillation signal to produce an incoming baseband signal; a transmitter section operably coupled to the local oscillator to receive the RF local oscillation signal, wherein the transmitter section receives an outgoing baseband signal, and wherein the transmitter section up-converts the outgoing baseband signal to produce an outgoing RF signal, the transmitter section further including a power amplifier driver for driving the outgoing RF signal; and an analog conversion block for producing a digital representation of the incoming baseband signal; a digital conversion block for producing an outgoing analog signal based upon a digital output signal; a baseband block for processing the digital representation of the incoming baseband signal and for producing the digital output signal; outgoing filtering, amplification circuitry to produce the outgoing baseband signal to the transmitter section; and a transmitter signal strength indicator (TSSI) for providing a signal strength indication to the baseband block based upon an output power of one of a power amplifier or a power amplifier driver, wherein the TSSI further includes a class B amplifier that produces one of a full-wave or half-wave rectified output wherein the class B amplifier is configured without a feedback loop; wherein the class B amplifier further includes a first filter block and further wherein the filter block is tuned to produce a filtered output at a negative output node that proportionally reflects an envelope magnitude plus a DC component; and wherein the TSSI does not have a feedback loop and further wherein the TSSI further includes a second low pass filter block for producing an envelope average based on an averaged output of the first filter block.