Back to results
US 5,959,475 AGranted
Complementary push-pull CMOS source follower analog video buffer
AssigneeXerox Corporation
InventorMehrdad Zomorrodi
Life of this patent
Estimating the term…
Abstract
An analog video buffer utilizes a complementary push-pull CMOS source follower video buffer with a feedback driver. The CMOS source follower provides a low impedance output node with high driving capabilities, high switching speed, and rail-to-rail linearity and the feedback driver isolates the output node from the feedback needed for the design of the video buffer to provide a transient response without ringing or overshoot.
Claims8
An analog video buffer comprising:
- an input means having an NMOS differential input amplifier, a PMOS differential input amplifier, a feedback receiving node and an input node for receiving an input signal to said video buffer;
- said NMOS differential input amplifier and said PMOS differential input amplifier each having an inverting input, a non-inverting input, and an output;
- said non-inverting inputs of said NMOS and PMOS differential input amplifiers being electrically connected to said input node of said input means and said inverting inputs of said NMOS and PMOS differential input amplifiers being electrically connected to each other at said feedback receiving node of said input means;
- a feedback means having a feedback node;
- said feedback means being electrically connected to said input means and being responsive to said input means;
- said feedback node of said feedback means being electrically connected to said feedback receiving node of said input means;
- a driver means having an output node for sending out an output signal from said analog video buffer;
- said driver means being electrically connected to said input means and said feedback means and being responsive to said input means;
- and
- said driver means and said feedback means being so constructed and arranged relative to each other that said output node is isolated from said feedback node.
7 more elements
An analog video buffer comprising:
- a first NMOS transistor having a source, a drain, and a gate;
- a first PMOS transistor having a source, a drain, and a gate;
- said first NMOS transistor and said PMOS transistor being electrically connected to each other through their sources at an output node;
- said drain of said first NMOS transistor being electrically connected to a power supply;
- said drain of said first PMOS transistor being grounded;
- an input means having an NMOS differential input amplifier, a PMOS differential input amplifier, a feedback receiving node and an input node for receiving an input signal to said video buffer;
- said NMOS differential input amplifier and said PMOS differential input amplifier each having an inverting input, a non-inverting input, and an output;
- said non-inverting inputs of said NMOS and PMOS differential input amplifiers being electrically connected to said input node of said input means and said inverting inputs of said NMOS and PMOS differential input amplifiers being electrically connected to each other at said feedback receiving node of said input means;
- said gate of said first NMOS transistor being electrically connected to said output of said NMOS differential input amplifier;
- said gate of said first PMOS transistor being electrically connected to said output of said PMOS differential input amplifier;
- and said analog video buffer being so constructed and arranged that said output node is isolated from said feedback receiving node.
8 more elements
Dependencies are inferred from the claim text.