Motorola Corporation

Motorola Solutions, Inc.

Siew Yin Lee

Chow Loong Cheah

Chen Kok Yeoh

Chin Wun Ng

Vc Prakash Vk Chacko

Communication equipment includes a circuit generating an RF input signal; a PA receiving a supply voltage, receiving the RF input signal, and providing an amplified version of the RF input signal as an output signal that is associated with an output power of the communication equipment; and an output circuit that includes an antenna for transmitting the output signal. The communication equipment also includes: a voltage detector circuit including sensing circuitry for sensing the supply voltage and a comparator for comparing the supply voltage to a first voltage threshold and generating a control signal when the supply voltage exceeds the first voltage threshold; and a disabling circuit coupled to the voltage detection circuit for disabling a portion of the communication equipment in response to the control signal to maintain output power of the communication equipment below a maximum output power level.

Method and apparatus for controling output power of communication equipment

A method and circuit are described for estimating I and Q amplitude imbalance occurring in a signal received by a direct conversion receiver (DCR). The DCR generates a mixing signal having a frequency substantially the same as the carrier signal of the signal received by an antenna. A mixing module mixes the mixing signal at different phases with the received signal to generate I and Q baseband signals. A frequency offset circuit generates an offset signal having a frequency offset from the carrier signal frequency. A coupling circuit selectively decouples the antenna from the DCR and couples the offset signal to the mixing module to generate a baseband test signal in the I and Q signal paths for determining an imbalance in the amplitudes of the baseband test signals between the I and Q signal paths.

Method and circuit for estimating in-phase/quadrature signal amplitude imbalance

A two-way radio ( ) that has a radio frequency receiver ( ) having a modulated radio frequency signal output and a variable bandwidth filter ( ) with an input coupled to the modulated radio frequency signal output. The radio ( ) also has demodulator circuitry ( ), a speaker ( ) and processing circuitry ( ). In use when the radio ( ) is operating in squelch mode, the processing circuitry ( ) controls the variable bandwidth filter ( ) to have a first bandwidth and when in unsquelch mode the processing circuitry ( ) controls the variable bandwidth filter ( ) to have a second bandwidth which has a smaller frequency range and the first bandwidth.

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Bayan Lepas, Malaysia

Siew Yin Lee