US5752172A — Distributed transmitter output power control circ…

Claim 1

Independent Claim 139 words

A transmitter circuit for use in a radio telephone, comprising: a power amplifier having an output coupled to an antenna for transmitting an amplified modulated RF signal; a variable gain driver amplifier having an output coupled to an input of said power amplifier and an input coupled to an output of a modulator, said variable gain driver amplifier being required to output the modulated RF signal within a predetermined dynamic power range having a maximum value; and at least one programmable gain amplifier coupled in series between said output of said modulator and said input of said variable gain driver amplifier, wherein said at least one programmable gain amplifier has a dynamic range selected for reducing the dynamic range requirement of said variable gain driver amplifier to be less than the maximum value of the predetermined dynamic power range.

Claim 2

Dependent Claim 139 words

A transmitter circuit for use in a radio telephone, comprising: a power amplifier having an output coupled to an antenna for transmitting an amplified modulated RF signal; a variable gain driver amplifier having an output coupled to an input of said power amplifier and an input coupled to an output of a modulator, said variable gain driver amplifier being required to output the modulated RF signal within a predetermined dynamic power range having a maximum value; and at least one programmable gain amplifier coupled in series between said output of said modulator and said input of said variable gain driver amplifier, wherein said at least one programmable gain amplifier has a dynamic range selected for reducing the dynamic range requirement of said variable gain driver amplifier to be less than the maximum value of the predetermined dynamic power range.

Claim 3

Dependent Claim 45 words

A transmitter circuit as set forth in claim 1, wherein said maximum value of said predetermined dynamic range is in excess of 60 dB, and wherein a maximum value of said dynamic power range of said variable gain driver amplifier is less than 50 dB.

Claim 4

Dependent Claim 140 words

A transmitter circuit for use in a radio telephone, comprising: a power amplifier having an output coupled to an antenna for transmitting an amplified modulated RF signal; a variable gain driver amplifier having an output coupled to an input of said power amplifier and an input coupled to an output of a modulator, said variable gain driver amplifier being required to output the modulated RF signal within a predetermined dynamic power range having a maximum value; and first and second programmable gain amplifiers coupled in series between said output of said modulator and said input of said variable gain driver amplifier, said first programmable gain amplifier having a first dynamic range that is adjustable in n steps, said second programmable gain amplifier having a second dynamic range that is adjustable in m steps, and wherein n is greater than m.

Claim 5

Dependent Claim 140 words

A transmitter circuit for use in a radio telephone, comprising: a power amplifier having an output coupled to an antenna for transmitting an amplified modulated RF signal; a variable gain driver amplifier having an output coupled to an input of said power amplifier and an input coupled to an output of a modulator, said variable gain driver amplifier being required to output the modulated RF signal within a predetermined dynamic power range having a maximum value; and first and second programmable gain amplifiers coupled in series between said output of said modulator and said input of said variable gain driver amplifier, said first programmable gain amplifier having a first dynamic range that is adjustable in n steps, said second programmable gain amplifier having a second dynamic range that is adjustable in m steps, and wherein n is greater than m.

Claim 6

Dependent Claim 22 words

A transmitter circuit as set forth in claim 3, wherein n is equal to 12, and wherein m is equal to 3.

Claim 7

Dependent Claim 31 words

A transmitter circuit as set forth in claim 3, wherein each of the n steps is equal to 1 dB, and wherein each of the m steps is equal 12 dB.

Claim 8

Dependent Claim 48 words

A transmitter circuit as set forth in claim 3, wherein said first and second programmable gain amplifiers have a cumulative dynamic range selected for reducing the dynamic range requirement of said variable gain driver amplifier to be less than the maximum value of the predetermined dynamic power range.

Claim 9

Dependent Claim 44 words

A transmitter circuit as set forth in claim 6, wherein said maximum value of said predetermined dynamic range is in excess of 60 dB, and wherein a maximum value of said dynamic range of said variable gain driver amplifier is less than 50 dB.

Claim 10

Dependent Claim 193 words

A mobile station having an antenna coupled to an input of a receiver and to an output of a transmitter, a modulator having an output coupled to an input of said transmitter for providing a modulated RF signal to said transmitter, and a controller, said transmitter comprising: a power control loop comprised of a power amplifier having an input coupled to an output of a variable gain driver amplifier, said variable gain amplifier having a control input for receiving a transmitter power control signal, a power sensor and detector coupled to an output of said power amplifier, and a circuit for comparing a maximum transmitted power control signal to an output of the detector for limiting a value of control signal applied to said variable gain driver amplifier; and at least one programmable gain amplifier having an input coupled to said modulator output and an output coupled to an input of said variable gain driver amplifier, said at least one programmable gain amplifier having a dynamic range that is wide enough to compensate for variations in gain that are caused by component tolerances in at least said modulator and said power control loop.

Claim 11

Dependent Claim 193 words

A mobile station having an antenna coupled to an input of a receiver and to an output of a transmitter, a modulator having an output coupled to an input of said transmitter for providing a modulated RF signal to said transmitter, and a controller, said transmitter comprising: a power control loop comprised of a power amplifier having an input coupled to an output of a variable gain driver amplifier, said variable gain amplifier having a control input for receiving a transmitter power control signal, a power sensor and detector coupled to an output of said power amplifier, and a circuit for comparing a maximum transmitted power control signal to an output of the detector for limiting a value of control signal applied to said variable gain driver amplifier; and at least one programmable gain amplifier having an input coupled to said modulator output and an output coupled to an input of said variable gain driver amplifier, said at least one programmable gain amplifier having a dynamic range that is wide enough to compensate for variations in gain that are caused by component tolerances in at least said modulator and said power control loop.

Claim 12

Dependent Claim 78 words

A mobile station as set forth in claim 8, wherein said transmitter is comprised of first and second programmable gain amplifiers coupled in series between said output of said modulator and said input of said variable gain driver amplifier, said first programmable gain amplifier having a first dynamic range that is adjustable in n steps, said second programmable gain amplifier having a second dynamic range that is adjustable in m steps, and wherein n is greater than m.

Claim 13

Dependent Claim 24 words

A mobile station as set forth in claim in claim 9, wherein n is equal to 12, and wherein m is equal to 3.

Claim 14

Dependent Claim 31 words

A mobile station as set forth in claim 9, wherein each of the n steps is equal to 1 dB, and wherein each of the m steps is equal 12 dB.

Claim 15

Dependent Claim 45 words

A mobile station as set forth in claim 9, wherein said first and second programmable gain amplifiers have a cumulative dynamic range selected for reducing a dynamic range requirement of said variable gain driver amplifier to be less than a predetermined maximum dynamic power range.

Claim 16

Dependent Claim 41 words

A mobile station as set forth in claim 12, wherein said predetermined maximum dynamic range is in excess of 60 dB, and wherein a maximum value of said dynamic range of said variable gain driver amplifier is less than 50 dB.

Claim 17

Independent Claim 148 words

A method of calibrating a transmitter circuit in a radio telephone, comprising the steps of: providing the transmitter circuit so as to include a power amplifier having an output coupled to an antenna, a variable gain driver amplifier coupled to an input of the power amplifier, and at least one programmable gain amplifier coupled between an output of a modulator and an input of the variable gain driver amplifier; setting a gain of the variable gain driver amplifier to a maximum level; setting a gain of the at least one programmable gain amplifier to a mid-level; measuring a power level at the output of the power amplifier; comparing the measured power level to an expected power level; and adjusting the gain of the at least one programmable gain amplifier to an adjusted value so as to bring the measured power level into agreement with the expected power level.

Claim 18

Independent Claim 148 words

A method of calibrating a transmitter circuit in a radio telephone, comprising the steps of: providing the transmitter circuit so as to include a power amplifier having an output coupled to an antenna, a variable gain driver amplifier coupled to an input of the power amplifier, and at least one programmable gain amplifier coupled between an output of a modulator and an input of the variable gain driver amplifier; setting a gain of the variable gain driver amplifier to a maximum level; setting a gain of the at least one programmable gain amplifier to a mid-level; measuring a power level at the output of the power amplifier; comparing the measured power level to an expected power level; and adjusting the gain of the at least one programmable gain amplifier to an adjusted value so as to bring the measured power level into agreement with the expected power level.

Claim 19

Dependent Claim 35 words

A method as set forth in claim 14, and further comprising a step of storing, in the radio telephone, an indication of the adjusted value for subsequent use during the operation of the radio telephone.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-05-11	2001-11-10	2002-05-12	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-05-11	2005-11-10	2006-05-12	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-05-11	2009-11-10	2010-05-12	$7700.00	Window Closed / Lapsed

Distributed transmitter output power control circuit and method for a radio telephone

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