IP Library Granted Patent US 7,847,585
Granted Patent B2
US 7,847,585 · App. 12/465,837 · Granted Dec 7, 2010

Source follower with active inductance as a load

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Quick Facts
Patent No.
US 7,847,585
App. No.
12/465,837
Granted
Dec 7, 2010
Kind
B2
Abstract

A semiconductor integrated circuit device comprises a transistor circuit exhibiting inductance at a desired frequency owing to capacitance between electrodes in a MOS transistor, the transistor circuit having an impedance that increases with an increase in frequency; and a first MOS transistor that functions as a source follower having the transistor circuit as a load.

Claims (29)

1. A semiconductor integrated circuit device, comprising:

a transistor circuit exhibiting inductance at a desired frequency owing to capacitance between electrodes in a MOS transistor, said transistor circuit having an impedance that increases with an increase in frequency; and

a first MOS transistor that functions as a source follower having said transistor circuit as a load,

wherein said transistor circuit includes,

a resistance element, and

a second MOS transistor, which has a conductivity type opposite that of said first MOS transistor, having a drain connected to a power supply, a gate connected to the power supply via said resistance element and a source connected to the source of said first MOS transistor.

2. A receiving apparatus comprising:

a terminating resistor connected across both ends of a transmission line, which transmits differential signals, on a receiving side of the transmission line; and

two of said semiconductor integrated circuit device set forth in claim 1 , wherein the gates of said first MOS transistors are connected to respective ones of both ends of said terminating resistor, and the sources of said first MOS transistors serve as output terminals;

wherein differential receive signals are output from output terminals of respective ones of the two semiconductor integrated circuit devices.

3. A semiconductor integrated circuit device, comprising:

a transistor circuit exhibiting inductance at a desired frequency owing to capacitance between electrodes in a MOS transistor, said transistor circuit having an impedance that increases with an increase in frequency; and

a first MOS transistor that functions as a source follower having said transistor circuit as a load,

wherein said transistor circuit includes,

a second MOS transistor, which has a conductivity type identical with that of said first MOS transistor, having a source connected to a power supply and a drain connected to the source of said first MOS transistor,

a third MOS transistor, which has a conductivity type opposite that of said first MOS transistor, having a drain connected to the power supply, a gate connected to the source of said first MOS transistor and a source connected to the gate of said second MOS transistor, and

a current source connected to the source of said third MOS transistor.

4. A receiving apparatus comprising:

a terminating resistor connected across both ends of a transmission line, which transmits differential signals, on a receiving side of the transmission line; and

two of said semiconductor integrated circuit device set forth in claim 3 , wherein the gates of said first MOS transistors are connected to respective ones of both ends of said terminating resistor, and the sources of said first MOS transistors serve as output terminals;

wherein differential receive signals are output from output terminals of respective ones of the two semiconductor integrated circuit devices.

5. A receiving apparatus comprising:

a terminating resistor connected across both ends of a transmission line, which transmits differential signals, on a receiving side of the transmission line; and

two of semiconductor integrated circuit devices, each comprising:

a transistor circuit exhibiting inductance at a desired frequency owing to capacitance between electrodes in a MOS transistor, said transistor circuit having an impedance that increases with an increase in frequency; and

a first MOS transistor that functions as a source follower having said transistor circuit as a load,

wherein the gates of said first MOS transistors are connected to respective ones of both ends of said terminating resistor, and the sources of said first MOS transistors serve as output terminals;

wherein differential receive signals are output from output terminals of respective ones of the two semiconductor integrated circuit devices.

6. The receiving apparatus according to claim 5 , further comprising a receiving buffer circuit which receives said differential receive signals output from said output terminals, and outputs a resultant signal.

Assignments (2)
CHANGE OF NAME Recorded Oct 26, 2010
From: NEC ELECTRONICS CORPORATION
To: RENESAS ELECTRONICS CORPORATION
Reel/Frame 025193/0165 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 14, 2009
From: TAKEDA, KANJI
To: NEC ELECTRONICS CORPORATION
Reel/Frame 022684/0270 →