Gurkanwal S Sahota from Rancho Santa Fe, CA, age 55

Us Patents

Method And Circuit For Providing Interface Signals Between Integrated Circuits
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US Patent:

6615027, Sep 2, 2003
Filed:

Jan 21, 2000
Appl. No.:

09/489231
Inventors:

Gurkanwal Sahota - San Diego CA
Mehdi H. Sani - San Diego CA
Sassan Shahrokhinia - San Diego CA
Assignee:

Qualcomm Incorporated - San Diego CA
International Classification:

H04B 102
US Classification:

455 91, 455 93, 341126, 341135, 341144
Abstract:

Circuitry that generates an interface signal between a first and a second integrated circuit (IC). The circuitry includes a reference circuit that provides a reference signal, an interface circuit, and a circuit element. The interface circuit is implemented on the first IC, operatively couples to the reference circuit, receives the reference signal and a data input, and generates the interface signal. The circuit element is implemented on the second IC, operatively couples to the control circuit, receives the interface signal, and provides an output signal. The reference signal can be a voltage or a current signal, and can be generated in the first or second IC. The interface circuit can be implemented with a current mirror coupled to a switch array, and can be oversampled to ease the filtering requirement. The interface signal can be a differential current signal having multiple (e. g. , four, eight, or more) bits of resolution.

Direct Conversion Digital Domain Control
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US Patent:

6694129, Feb 17, 2004
Filed:

Dec 10, 2001
Appl. No.:

10/015988
Inventors:

Paul E. Peterzell - San Diego CA
Gurkanwal Sahota - San Diego CA
Assignee:

Qualcomm, Incorporated - San Diego CA
International Classification:

H04B 140
US Classification:

455 76, 455 78, 455 88, 455208
Abstract:

A system and method for a multi-band direct conversion wireless communication receiver is presented. The system incorporates a low noise amplifier (LNA) configured to amplify received RF signals, a local oscillator (LO) configured to output a frequency, and I and Q channel mixers. Each mixer has a first input operatively coupled to the LNA, a second input operatively coupled to the LO output, and an output. The system further includes an adjustment mechanism configured to adjust drive level of the LO depending on a level of jammers detected by the receiver. Thus, the receiver may operate in multiple wireless communication bands and modes and meet the associated specifications.

Gain Linearizer For Variable Gain Amplifiers
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US Patent:

6711391, Mar 23, 2004
Filed:

Oct 10, 2000
Appl. No.:

09/686265
Inventors:

Brett C. Walker - San Diego CA
Eric Zeisel - San Diego CA
Gurkanwal S. Sahota - San Diego CA
Assignee:

Qualcomm, Incorporated - San Diego CA
International Classification:

H04B 106
US Classification:

4552341, 4551273
Abstract:

Techniques to linearly (in dB) adjust the gains of variable gain elements (i. e. , variable gain amplifiers or VGAs) in a receiver or transmitter. An input control signal is provided to a conditioning circuit that conditions the control signal to achieve various signal characteristics. The input control signal is limited to within a particular range of values, temperature compensated, scaled (or normalized) to the supply voltages, shifted with an offset, or manipulated in other fashions. The conditioned signal is then provided to an input stage of a linearizer that generates a set of exponentially related signals. This is achieved using, for example, a differential amplifier in which the conditioned control signal is applied to the inputs of the differential amplifier and the collector currents from the differential amplifier comprises the exponentially related signals. An output stage within the linearizer receives the exponentially related signals and, in response, generates a gain control signal. By approximately matching the output stage to a gain stage of the variable gain element and by using the gain control signal generated by output stage, the gain transfer function of the VGA approximates that of the exponentially related signals.

System And Method For Power Control Calibration And A Wireless Communication Device
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US Patent:

6819938, Nov 16, 2004
Filed:

Jun 20, 2002
Appl. No.:

10/177057
Inventors:

Gurkanwal Singh Sahota - San Diego CA
Assignee:

Qualcomm Incorporated - San Diego CA
International Classification:

H04B 700
US Classification:

455522, 4551271, 4551272
Abstract:

A technique for calibrating the open-loop transmit power of a wireless communication device overcomes the inherent nonlinearities in the gain control input of a variable gain amplifier (VGA). In one embodiment, a feedback circuit generates a signal indicative of the transmit power. This signal is compared with a desired transmit power level, which comprises an open-loop gain component and a closed-loop gain component. The desired transmit power level is compared with the actual transmit power level and an error signal is generated. The error signal is used to alter the gain of the VGA in the transmitter to thereby adjust the actual transmit power level to correspond with the desired transmit power level. In alternative embodiment, the receiver portion, which also contains a VGA, is pre-calibrated in a conventional manner. During a transmitter calibration process, the transmitter is coupled to the receiver input through a mixer and filter.

Local Oscillator Leakage Control In Direct Conversion Processes
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US Patent:

6960962, Nov 1, 2005
Filed:

Dec 10, 2001
Appl. No.:

10/020607
Inventors:

Paul E. Peterzell - San Diego CA, US
David Maldonado - Chula Vista CA, US
Kevin Gard - San Diego CA, US
Puay Hoe See - San Diego CA, US
Jeremy Dunworth - Cardiff CA, US
Gurkanwal Sahota - San Diego CA, US
Assignee:

Qualcomm Inc. - San Diego CA
International Classification:

H03B021/01
H03L007/00
H04B001/00
US Classification:

331 40, 331 25, 331 37, 331 41, 331 74, 455313
Abstract:

A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is divided by a number N to produce a signal having a divided-down frequency. The signal having the VCO frequency is then mixed with the signal having the divided-down frequency to produce an output signal having an output frequency. Local oscillator leakage is reduced. Thus, the receiver or transmitter may operate in multiple wireless communication bands and modes and meet the associated specifications.

Direct Conversion With Variable Amplitude Lo Signals
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US Patent:

7027793, Apr 11, 2006
Filed:

Nov 15, 2002
Appl. No.:

10/295639
Inventors:

Kevin Gard - San Diego CA, US
Anthony Segoria - San Diego CA, US
Gurkanwal (Kamal) Sahota - San Diego CA, US
Charles Persico - Rancho Santa Fe CA, US
Assignee:

Qualcomm Incorporated - San Diego CA
International Classification:

H04B 1/30
US Classification:

455318, 4552511, 4551151, 4552261, 455296, 375297, 375285
Abstract:

Techniques to reduce LO leakage by controlling the amplitude of LO signal based on the level of output signal after the frequency conversion process. An LO generator receives a VCO signal and generates an LO signal having a variable amplitude and a frequency that is related to the frequency of the VCO signal. A variable gain amplifier receives a control signal and adjusts the amplitude of the LO signal based on the control signal. The variable amplitude LO signal is used for frequency upconversion (e. g. , direction upconversion) of an input signal (e. g. , at baseband) to obtain an output signal (e. g. , at RF). The relationship between LO signal amplitude and output signal level may be defined by a particular transfer function. In general, the LO signal is set higher for higher output signal level and is reduced proportionally for lower output signal level.

System And Method For Power Control Calibration And A Wireless Communication Device
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US Patent:

7076266, Jul 11, 2006
Filed:

Oct 12, 2004
Appl. No.:

10/964404
Inventors:

Gurkanwal Singh Sahota - San Diego CA, US
Assignee:

Qualcomm Inc - San Diego CA
International Classification:

H04B 7/00
US Classification:

455522, 4551272, 455 6711, 375219, 375297
Abstract:

A technique for calibrating the open-loop transmit power of a wireless communication device overcomes the inherent nonlinearities in the gain control input of a variable gain amplifier (VGA). In one embodiment, a feedback circuit generates a signal indicative of the transmit power. This signal is compared with a desired transmit power level, which comprises an open-loop gain component and a closed-loop gain component. The desired transmit power level is compared with the actual transmit power level and an error signal is generated. The error signal is used to alter the gain of the VGA in the transmitter to thereby adjust the actual transmit power level to correspond with the desired transmit power level. In alternative embodiment, the receiver portion, which also contains a VGA, is pre-calibrated in a conventional manner. During a transmitter calibration process, the transmitter is coupled to the receiver input through a mixer and filter.

Linear Transconductance Cell With Wide Tuning Range
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US Patent:

7145395, Dec 5, 2006
Filed:

Sep 16, 2004
Appl. No.:

10/944145
Inventors:

Prasad Gudem - San Diego CA, US
Gurkanwal Kamal Sahota - San Diego CA, US
Assignee:

Qualcomm Incorporated - San Diego CA
International Classification:

H03G 3/12
US Classification:

330283, 330253, 330305
Abstract:

A transconductance cell is disclosed. The transconductance cell may be single-ended or differential. The transconductance cell may include a tunable degeneration circuit. The tunable degeneration circuit may have a plurality of field effect transistors connected in series with each of the field effect transistors having a gate configured to receive a tuning voltage.