Haydar Bilhan

US Patent:

6628164, Sep 30, 2003

Filed:

Apr 16, 2002

Appl. No.:

10/123642

Inventors:

M. C. Ramesh - Dallas TX
Feng Ying - Plano TX
Haydar Bilhan - Dallas TX
Gary Lee - Plano TX
Yong Han - Plano TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03F 102

US Classification:

330 9, 330 69, 330109, 327124

Abstract:

A programmable gain amplifier using metal-oxide-semiconductor (MOS) devices to approximate exponential gain characteristic with linear control signals is disclosed. According to one embodiment, the programmable gain amplifier ( ) may include a capacitive switching circuit ( ), a capacitive switching circuit ( ), and an operational amplifier ( ). Capacitive switching circuits ( and ) may receive an analog input voltage through sample switches ( and ). Capacitive switching circuit ( ) receives an output from operational amplifier ( ) through feedback switch ( ). The programmable gain amplifier ( ) may include a few additional unit capacitors which can allow larger gain ranges or more steps for a given range without a large increase in chip size.

US Patent:

6750910, Jun 15, 2004

Filed:

Jul 15, 1999

Appl. No.:

09/353919

Inventors:

Haydar Bilhan - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04N 964

US Classification:

348243, 348311

Abstract:

An apparatus for providing optical black and offset calibration for an array signal comprising a sequence of voltage levels corresponding to a sequence of voltage samples of charge coupled devices arranged in an array. The apparatus includes a correlated double sampler adapted to receive the array signal and provide as an output a modified array signal comprising a sequence of first corrected output voltage levels. A programmable gain amplifier receives the modified array signal and provides as an output an amplified modified array signal comprising a sequence of second corrected output voltage levels. An analog to digital converter receives the amplified modified array signal and provides as an output a sequence of digital values. A digital signal storage device stores a digital value corresponding to a desired optical black level. A digital to analog converter stores a correction value corresponding to a determined correction and compensates the amplified modified array signal, based on the correction value, for variations from a desired black level.

US Patent:

6753913, Jun 22, 2004

Filed:

Sep 1, 2000

Appl. No.:

09/654192

Inventors:

Haydar Bilhan - Dallas TX
Gary E. Lee - Plano TX
Ramesh Chandrasekaran - Dallas TX
Feng Ying - Plano TX
Xucheng Wang - Plano TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04N 5217

US Classification:

348241, 348243

Abstract:

An image processing apparatus for charge coupled device (CCD) and video inputs in a digital camera or for a digital camcorder is disclosed which provides optical black and offset correction for CCD inputs. A sampling circuit, including correlated double sampler (CDS) ( ) and programmable gain amplifier ( ), samples the image input signal and the video input signal. CDS ( ) includes a single-ended amplifier ( ) and a differential amplifier ( ). The single-ended amplifier ( ) functions such that it is only operable during an CCD signal input; otherwise, the single-ended amplifier ( ) is bypassed such that a video signal is only sampled by the differential amplifier ( ). For CCD signals, the single-ended amplifier ( ) samples the reference level of the pixel and holds it during the video interval. The differential amplifier ( ) samples both the output of the single ended amplifier ( ) and the video level of the same pixel. Overall, the CDS ( ) subtracts these levels and converts the difference to a differential output to improve signal to noise performance and dynamic range.

US Patent:

6778113, Aug 17, 2004

Filed:

Jun 3, 2002

Appl. No.:

10/160724

Inventors:

Gonggui Xu - Plano TX
Haydar Bilhan - Dallas TX
Huimin Xia - Richardson TX
Feng Ying - Plano TX
Xiaopeng Li - Plano TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03M 166

US Classification:

341144, 341135

Abstract:

A shunt-shunt feedback current to voltage converter ( ) including a compensating current ( ) provided to the output of the amplifier ( ) which mirrors the input current ( ) advantageously removing the loading effects of the feedback resistor (R ) to the amplifier ( ). A current steering DAC ( ) is utilized in conjunction with a plurality of polarity control switches ( ) to provide either a source current or a sink current to the amplifier input, and a complementary sink current or source current, respectively, to the output of the amplifier such that the amplifier ( ) does not provide any current to the feedback resistor. Thus, DC gain of the amplifier is maintained. The current steering DAC ( ) provides a matched source current and sink current to achieve this architecture.

US Patent:

6791607, Sep 14, 2004

Filed:

Nov 1, 2000

Appl. No.:

09/703558

Inventors:

Haydar Bilhan - Dallas TX
Ramesh Chandrasekaran - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04N 964

US Classification:

348243, 348250

Abstract:

An image processing apparatus for a charge coupled device including analog front end circuitry having optical black and offset correction, whereby the an offset and optical black correction circuit has a digitally programmable bandwidth is disclosed herein. The image processing apparatus includes a sampling circuit to sample the incoming optical black signal output from a CCD. The sampled signal is filtered through an analog-to-digital converter for processing by a digital detector circuit which detects the average optical black level of the sampled signal. The sum of the channel offset and optical black level present at the output of the digital detector circuit as a digital error signal is averaged for a given number of lines and optical black cells per line by a digital averager included within the digital detector circuit. Moreover, calibration logic digitally calibrates the channel to obtain a user programmed ADC output which corresponds to that average. Furthermore, the correction circuit includes a digital-to-analog converter that converts the difference into an analog signal to be applied as an adjustment to the analog image signal at the input of the image processing apparatus.

US Patent:

6829007, Dec 7, 2004

Filed:

Aug 30, 2000

Appl. No.:

09/651208

Inventors:

Haydar Bilhan - Dallas TX
Ramesh Chandrasekaran - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04N 5217

US Classification:

348243, 348241

Abstract:

An image processing apparatus ( ) for a charge coupled device having hot/cold pixel and line noise filtering is disclosed which provides optical black and offset correction. The present invention teaches an offset and optical black correction circuit having a digital filter to obtain noise-free optical black correction for charge-coupled devices such that a digitally programmable bandwidth exists. The sum of the channel offset and optical black level is averaged for a given number of lines having a number of optical black cells per line and this sum passes through a digital filter. Moreover, the channel is digitally calibrated to obtain a user programmed ADC ( ) output which corresponds to that average.

US Patent:

6940342, Sep 6, 2005

Filed:

Apr 7, 2003

Appl. No.:

10/408592

Inventors:

M. C. Ramesh - Dallas TX, US
Feng Ying - Plano TX, US
Haydar Bilhan - Dallas TX, US
Gary Lee - Plano TX, US
Yong Han - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03F001/02

US Classification:

330 9, 330 69

Abstract:

A programmable gain amplifier using metal-oxide-semiconductor (MOS) devices to approximate exponential gain characteristic with linear control signals is disclosed. According to one embodiment, the programmable gain amplifier () may include a capacitive switching circuit (), a capacitive switching circuit (), and an operational amplifier (). Capacitive switching circuits (and ) may receive an analog input voltage through sample switches (and ). Capacitive switching circuit () receives an output from operational amplifier () through feedback switch (). The programmable gain amplifier () may include a few additional unit capacitors which can allow larger gain ranges or more steps for a given range without a large increase in chip size.

US Patent:

6940548, Sep 6, 2005

Filed:

Nov 27, 2001

Appl. No.:

09/995118

Inventors:

Feng Ying - Plano TX, US
Yong Han - Plano TX, US
Haydar Bilhan - Dallas TX, US
Lieyi Fang - Plano TX, US
Ramesh Chandrasekaran - Dallas TX, US
Gary Lee - Plano TX, US
Gonggui Xu - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04N005/217

US Classification:

348241, 348243, 348250

Abstract:

An image processing apparatus () for a charge coupled device including analog front end circuitry having optical black and offset correction, whereby the offset and optical black correction circuit is programmable. The present invention includes a first circuit () to sample the incoming optical black signal output from a CCD. This first circuit includes a correlated double sampler () coupled to a first programmable gain amplifier (). An adder () connects between the first programmable gain amplifier () and a second gain amplifier () for adding in the optical black offset to the optical black signal input from the CCD. A second circuit () includes a reverse programmable gain amplifier () connected to the output of the second programmable gain amplifier () to amplify the optical black level inversely proportional to the gain from the second programmable gain amplifier (). The second circuit () also includes an integrator () coupled to the reverse programmable gain amplifier () to integrate the difference between the incoming signal and the desired optical black value. The second circuit () couples to the adder () to add the positive and negative difference to the optical black signal.