Texas Instruments Corporation

Vajeed Nimran P A

Sandeep Kesrimal Oswal

Ravikumar Pattipaka

Aravind Miriyala

Raja Sekhar Kanakamedala

Visvesvaraya Appala Pentakota

Shagun Dusad

Shabbir Amjhera Wala

Methods and apparatus for reducing a transient glitch in ultrasound applications are disclosed. An example apparatus includes a transducer to (A) output a signal during a transmit phase and (B) receive a reflected signal corresponding to the signal during a receive phase; a receiver switch coupled to the transducer at a first node, the receiver switch to (A) open during the transmit phase and (B) close during the receive phase; and a clamp coupled to the transducer at the first node, the clamp to provide a high impedance during the transmit phase and the receive phase and provide a low impedance during a transient phase.

Methods and apparatus for reducing a transient glitch in ultrasound applications

A mixer circuit includes three square wave mixers and a combiner. A first square wave mixer in the circuit multiplies an input signal with a first square wave. A second square wave mixer and a third square wave mixer in the circuit each multiplies the input signal with a second square wave and a third square wave respectively. The second and third square waves have a same frequency as the first square wave, but phases that respectively lead and lag the phase of the first square wave by a first value. The combiner adds the outputs of the mixers. A low-pass filter external to the mixer circuit filters the sum generated by the combiner to generate a filtered output. In an embodiment, the first value equals forty five degrees, and the filtered output is rendered free of products generated by third and fifth harmonics of the first square wave square.

Cancellation of products generated by harmonics of a square wave used in square-wave mixing

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Bengaluru, India

Vajeed Nimran P A