News Column

Researchers Submit Patent Application, "Amplifier Circuits and Methods of Amplifying an Input Signal", for Approval

July 23, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Thomsen, Axel (Austin, TX); Yuan, Gang (Austin, TX), filed on December 31, 2012, was made available online on July 10, 2014.

No assignee for this patent application has been made.

News editors obtained the following quote from the background information supplied by the inventors: "Often, signal processing circuits include an amplifier, such as a programmable gain amplifier (PGA). Such signal processing circuits may be configured to perform audio signal processing, video signal processing, image processing, and control operations (such as motor control operations), to name a few of many possible applications. Sometimes, a relatively low-power circuit, such as micro-control unit (MCU) or a sensor, may be coupled to a relatively high-power circuit, such as a motor control inverter, a switched mode power supply, or a direct current (DC) to alternating current (AC) inverter for solar conversion. In such cases, a high impedance interface may be used to connect the circuits, allowing for implementation of passive filters, such as protection resistors, breakdown diodes, and the like."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "In an embodiment, a method of operating an amplifier circuit having a pre-charge phase and a sample/conversion phase includes, during a pre-charge phase, charging first and second capacitors to first and second bias voltages. The first capacitor is coupled to a first input of an amplifier circuit, which has a second input and an output. The second capacitor is coupled to the second input. During a sample/conversion phase, the first input of the amplifier circuit is coupled to an input signal through the first capacitor to level-shift the input signal according to the first bias voltage and the output of the amplifier is coupled to the second input through the second capacitor to level shift a feedback signal according to the second bias voltage.

"In another embodiment, a circuit includes an amplifier circuit including a first input, a second input, and an output. The circuit further includes a first capacitor configured to be coupled in series between a first input signal and the first input and includes a first feedback capacitor configured to be coupled in series between the output and the second input. The circuit further includes a plurality of switches coupled to the first capacitor and to the first feedback capacitor. The circuit also includes a controller configured to control the plurality of switches to pre-charge the first capacitor and the first feedback capacitor to first and second bias voltages, respectively, during a pre-charge phase. The controller is configured to control the plurality of switches to couple the first input signal to the first input of the amplifier circuit and to couple the output to the second input during a sample phase.

"In still another embodiment, a circuit includes an amplifier circuit including having a first input, a second input, a first output, a second output, a first feedback input and a second feedback input. The circuit further includes a first capacitor coupled to the first input, a second capacitor coupled to the second input, a first feedback capacitor coupled to the first feedback input, and a second feedback capacitor coupled to the second feedback input. The circuit also includes a plurality of switches coupled to the first and second capacitors and to the first and second feedback capacitors and a control circuit coupled to the plurality of switches. The control circuit is configured to control the plurality of switches to pre-charge the first and second capacitors to a first bias voltage and the first and second feedback capacitors to a second bias voltage during a pre-charge phase. The control circuit is further configured to control the plurality of switches to couple first and second input signals to the first and second inputs and first and second feedback signals to the first and second feedback inputs, respectively, during a sample phase.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a diagram of an amplifier circuit including a single-ended input and an AC-coupling and level-shift circuit according to an embodiment.

"FIG. 2 is a diagram of an amplifier circuit including differential inputs and an AC-coupling and level-shift circuit according to an embodiment.

"FIG. 3 is a diagram of an amplifier circuit including differential inputs and an AC-coupling and level-shift circuit according to a second embodiment.

"FIG. 4 is a diagram of an amplifier circuit including differential inputs and an AC-coupling and level-shift circuit according to a third embodiment.

"FIG. 5 is a diagram of an amplifier circuit including differential inputs and an AC-coupling and level-shift circuit according to a third embodiment including an offset feedback path.

"FIG. 6 is a partial schematic diagram of a circuit including a switching circuit and a capacitive coupling circuit of FIGS. 1-5 according to an embodiment.

"FIGS. 7-9 are illustrative examples of timing diagrams depicting a changing input voltage, auto-zero and pre-charge timing signals, and resulting output voltage signals for embodiments of the amplifiers of FIGS. 1-6.

"FIG. 10 is a flow diagram of a method of providing an amplified output signal according to an embodiment.

"FIG. 11 is a flow diagram of a method of providing an amplified output signal according to a second embodiment.

"In the following discussion, the same reference numbers are used in the various embodiments to indicate the same or similar elements."

For additional information on this patent application, see: Thomsen, Axel; Yuan, Gang. Amplifier Circuits and Methods of Amplifying an Input Signal. Filed December 31, 2012 and posted July 10, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=5591&p=112&f=G&l=50&d=PG01&S1=20140703.PD.&OS=PD/20140703&RS=PD/20140703

Keywords for this news article include: Patents, Electronics, Signal Processing.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Electronics Newsweekly


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters