Texas Instruments Corporation

Michel Frechette

Abdellatif Bellaouar

Anand Ganesh Dabak

Anuj Batra

Jaiganesh Balakrishnan

Abhijit Kumar Das

Ranjit Gharpurey

Heng-Chih Lin

Paul H Fontaine

Sherif Embabi

Ahmed N Mohieldin

Maher A Abuzaid

A variable gain amplifier may include a master amplifier that may be configured to generate a first current and a diode coupled with the master amplifier so that the first current passes through the diode which, when the first current is passing through the diode, generates a diode voltage signal. According to embodiments, an error amplifier may include a first input configured to receive a gain control voltage signal and a second input configured to receive the diode voltage signal. The output of the error amplifier may provide a feedback signal. The amplifier may include a circuit configured to generate at least one voltage control signal based on the feedback signal and a slave amplifier configured to adjust a gain amount based on the at least one voltage control signal.

Variable gain amplifier having automatic power consumption optimization

System for ultra-wideband communications providing high data rates over an extended operating range in the presence of interferers. A preferred embodiment comprises an ultra-wideband (UWB) device that makes use of a portion of the UWB frequency range to help provide good performance in the presence of interferers. Additionally, since only a portion of the UWB frequency range is used, multiple devices can simultaneously transmit and receive by using different portions of the UWB frequency range.

Ultra-wideband communications system devices

An integrated circuit (ICT) comprising a filter ( ). The filter comprises an input (&ugr; &plus;) for receiving an input signal and an output ( ) for producing an output signal having a frequency cutoff point. The filter further comprises at least one resistor network (RN ) coupled between the input and the output. The resistor network comprises a first non-switched resistance (R ) and a first resistance series connection connected in parallel with the first non-switched resistance. The first resistance series connection comprises a switched resistance (R ) connected in series with a source/drain path of a switching transistor (TRR ), the switching transistor having a gate for receiving a control signal. The frequency cutoff point is adjustable in response to the control signal. Additionally, the switched resistance has a first resistance and the switching transistor has an on-resistance. Further, the on-resistance is at least 20 percent of the total of the first resistance and the on-resistance.

High frequency tunable filter

A system and method for converting an analog control voltage to a PTAT current. A plurality of differential transistor pairs is provided, each differential pair including a reference transistor and a non-reference transistor, each transistor having a current path and a control electrode. A first output is coupled to a first end of the current path of each of said non-reference transistors and output means is coupled to a first end of the current path of each of the reference transistors. A plurality of current sources is provided, one current source for each differential pair, each current source having a current path coupled to an opposing end of the current path of a different one of the transistor pairs and a control electrode. A PTAT current generator is coupled to the control electrode of each of the current sources. Each differential pair is provided with a pair of electron emitting electrodes coupled together, the current source being coupled to the electron emitting electrodes. The current sources can provide the same or different current outputs. A pair of such circuits can be provided, each with a different slope, with a control determining which circuit output will be provided to the system.

Direct voltage to PTAT current converter for multiple gain control slope for wide dynamic range VGA

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Plano, TX, United States of America

Michel Frechette