Motorola Corporation

Other

Motorola Mobility LLC

John Richard Oakley

James David Hughes

John M Burgan

Clinton C Powell, Ii

James H Carlquist

Robert K Schweickert

Lynn R Freytag

Kevin B Traylor

Glen James Zoerner

Clinton C Ii Powell

An automatic gain control system () and methods thereof for a receiver for providing a wide range of continuous gain control has been discussed. The AGC includes an input stage () for providing an indication of a strength of a received signal; an attenuator stage () operable to switch a fixed amount of attenuation for the received signal; a variable attenuator () to provide a variable amount of attenuation for said received signal, and a controller () responsive to said indication for providing a variable control signal () to the variable attenuator; wherein the controller concurrently changes the variable control signal to change in the opposite direction the variable amount of attenuation by approximately the fixed amount of attenuation whenever the attenuator stage is switched, thereby extending the range of continuous gain control beyond the range of the variable attenuator.

Automatic gain control system having a wide range of continuous gain control

An automatic gain control (AGC) system () for a controlled gain receiver () includes a magnitude generator () and a gain corrector (). The magnitude generator () generates a binary voltage squared signal () having a binary value that is directly proportional to a recovered signal power of an intercepted signal (). The gain corrector () determines an adjustment of a gain control value () as a multiple of increments that are approximately 3 decibel (dB), by shifting () a reference threshold by one or more bits and comparing () the shifted reference threshold to the binary voltage squared signal. An initial setting of a state of a step attenuator () during a track mode () is determined during a warm up mode () by comparing the binary voltage squared signal () to two different thresholds (). A filter () accommodates a variety of bandwidths and symbol rates by settings of an accumulator () and scaler () that are included in the filter (). A received signal strength indicator function () of the controlled gain receiver () generates a low resolution or high resolution RSSI signal (), depending on the mode. The value of the low resolution RSSI signal () is directly proportional to the power of the intercepted signal ().

Digitized automatic gain control system and methods for a controlled gain receiver

A method and apparatus for applying patches to a code or data residing on a non-volatile memory device is illustrated. A code residing at a first location in a non-volatile memory can be replaced by a codes residing at a second locations in a memory map. A patching device compares a first address of a first code to an address identified by a pre-fetch instruction. If the first address matches the address identified by the pre-fetch instruction, a pre-fetch abort is issued to facilitate replacing a bad code residing at the first address with a good code. The good code can be pointed to by a vector in a vector table where the address of the vector is dynamically loaded into a program counter.

Method and apparatus for patching code and data residing on a memory

A power measurement element () measures () the wide-band received signal power of a receiver (), and a wide-band AGC system () transfers () receiver gain control from an on-channel AGC system () to the wide-band AGC system, when the wide-band received signal power exceeds a pre-programmed threshold for longer than a pre-programmed delay time. The wide-band AGC system is arranged and programmed to decrease () a front-end gain of the receiver through a plurality of gain steps of a pre-programmed size () applied at a pre-programmed rate until the received wide-band signal power falls below the pre-programmed threshold.

Method and apparatus in a wireless communication device for mitigating a received power overload

A symbol independent automatic frequency controller ( ) includes a symbol correlator ( ) for receiving a complex digital signal generated within a selective call receiver wherein the symbol correlator provides a real signal ( ), an imaginary signal ( ), and a magnitude signal ( ), a discriminator ( ) coupled to the symbol correlator for receiving and processing the real signal and the imaginary signal to provide a frequency error signal, a low pass filter ( ) and comparison element ( ) for filtering the magnitude signal and comparing the magnitude signal to a predetermined lock threshold signal that controls the bandwidth of the symbol correlator in the event the magnitude signal exceeds the lock threshold signal, and a feedback loop providing the imaginary signal ( ) to an accumulator ( ) and back to the symbol correlator wherein the accumulator provides the symbol correlator with an apriori-symbol phase feedback ( ).

Method and apparatus for symbol independent discriminator correlator automatic frequency control

An electronic device ( ) includes squaring circuit ( ) that includes a logarithmic compression function ( ), a squaring function ( ), a doubling function ( ), and a logarithmic decompression function ( ). The logarithmic compression function ( ) accepts a binary input ( ) of width W and value X, and produces an output having a binary power component ( ) and a binary magnitude component ( ). The squaring function ( ) generates an adjusted squared magnitude component ( ) and a selection signal ( ). The doubling function ( ) generates a doubled power component ( ). The logarithmic decompression function ( ) generates an approximate squared output ( ) of width 2W from the doubled power and adjusted squared magnitude components ( ). The approximate squared output ( ) has a value that approximates the square of X to a predetermined amount of precision, N.

Squaring circuit and electronic device using same

An automatic gain control (AGC) system ( ) for a controlled gain receiver ( ) includes a magnitude generator ( ) and a gain corrector ( ). The magnitude generator ( ) generates a binary voltage squared signal ( ) having a binary value that is directly proportional to a recovered signal power of an intercepted signal ( ). The gain corrector ( ) determines an adjustment of a gain control value ( ) as a multiple of increments that are approximately 3 decibel (dB), by shifting ( ) a reference threshold by one or more bits and comparing ( ) the shifted reference threshold to the binary voltage squared signal. An initial setting of a state of a step attenuator ( ) during a track mode ( ) is determined during a warm up mode ( ) by comparing the binary voltage squared signal ( ) to two different thresholds ( ).

A digital tone generator ( ) includes a digital signal generator ( ) which generates a digital waveform data sequence which is representative of a tone having a predetermined waveform, and an adaptive duty cycle pulse-width modulator ( ) which is responsive to the digital waveform data sequence for generating an an adaptive duty cycle period characterized by a pulse-width modulated digital tone signal having a variable frequency and duty cycle which is generated by selecting a variable number of clock pulses of a predetermined reference clock ( ).

Digital tone generator

A digital tone generator ( ) includes a digital signal generator ( ) which generates a digital waveform data sequence which is representative of a tone having a predetermined waveform, and a pulse-width modulator ( ) which provides an adaptive duty cycle period ( ) which is responsive to the digital data waveform data sequence for selecting clock pulses of a number sufficient to generate a pulse-width modulated digital tone signal. The digital tone generator ( ) can also include a low pass filter ( ) which processes the pulse-width modulated digital tone signal to generate an analog tone signal. The digital waveform sequences generated by two digital tone generators ( ) can be digitally added by a digital adder ( ) to provide a composite tone data signal, which can be processed by the adaptive pulse-width modulator ( ) to produce a pulse-width modulated tone signal representative of a DTMF tone.

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Round Rock, TX, United States of America

John Richard Oakley