Granted Patent B2

US 10,469,043 · App. 15/461,667 · Granted Nov 5, 2019

Inventors: Isaac Ko (Kwun Tong, HK); Ka Wai Ho (Diamond Hill, HK); Wan Tim Chan (Yuen Long, HK)

Assignee: Microchip Technology Incorporated

H03F3/265A61B8/4272A61B8/4483H03B5/32H03F1/3205H03F3/3023H03F2200/261H03F2200/372H03F2200/498H03F2200/75

Abstract

Claims (13)

1. An ultrasound probe buffer comprising:

a high impedance amplifier having a common-source core stage with series-series local feedback;

wherein the high impedance amplifier comprises:

a first MOSFET and a second MOSFET, wherein a drain terminal of the first MOSFET is coupled to a drain terminal of the second MOSFET;

a first source degeneration resistor coupled to a source terminal of the first MOSFET;

a second source degeneration resistor coupled to a source terminal of the second MOSFET; and

an operational amplifier having a first input coupled to the drain terminal of the first MOSFET and the drain terminal of the second MOSFET;

wherein an output of the operational amplifier is coupled via a resistor to a gate terminal of the second MOSFET.

2. The ultrasound probe buffer of claim 1 , wherein the resistance of the first source degeneration resistor is equal to the resistance of the second source degeneration resistor.

3. The ultrasound probe buffer of claim 1 , wherein the high impedance amplifier outputs an output current from the drain terminals of the first MOSFET and the second MOSFET.

4. The ultrasound probe buffer of claim 1 , wherein a gate terminal of the first MOSFET is coupled to a gate terminal of the second MOSFET via at least one capacitor.

5. The ultrasound probe buffer of claim 1 , wherein the first MOSFET is a p-type MOSFET and the second MOSFET is an n-type MOSFET.

6. The ultrasound probe buffer of claim 1 , wherein the transconductance of the ultrasound probe buffer is substantially constant.

Assignments (13)

Continuity (2)