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US 4,728,819 AGranted
Switching network
AssigneeHoneywell Inc.
InventorTho T. Vu
Life of this patent
Estimating the term…
Abstract
A switching network for a GaAs semiconductor circuit employing four FETs. The FETs are configured in a ring pattern which is connected to two matched current sources. Also disclosed is a sample-and-hold circuit employing such a switching network.
Claims17
A switching network comprising:
- an input means;
- an output means;
- a first FET having its drain electrically connected to its gate and its source electrically connected to the input means;
- a second FET having its drain electrically connected to its gate and the drain of the first FET, and its source electrically connected to the output means;
- a third FET having its drain electrically connected to its gate and further having its drain and gate electrically connected to the source of the second FET and the output means;
- a fourth FET having its drain electrically connected to its gate, and further having its drain and gate electrically connected to the input means and the source of the first FET, and having its source electrically connected to the source of the third FET;
- a first current generating means having first and second terminals wherein the first current generating means first terminal is grounded and its second terminal is electrically connected between the drains of the first and second FETs;
- a second current generating means having first and second terminals wherein the second current generating means first terminal is grounded and its second terminal is electrically connected between the sources of the third and fourth FETs;
- and
- switch control means for gating the four FETs of the switching network on and off.
7 more elements
A switching network comprising:
- an input means;
- an output means;
- a first FET having its drain electrically connected to its gate and its source electrically connected to the input means;
- a first diode having its cathode electrically connected to the drain of the first FET;
- a second FET having its drain electrically connected to its gate and its source electrically connected to the output means;
- a second diode having its cathode electrically connected to the drain of the second FET and its anode electrically connected to the anode of the first diode;
- a third diode having its anode electrically connected to the output means;
- a fourth diode having its anode electrically connected to the input means and it cathode electrically connected to the cathode of the third diode;
- a first current generating means having first and second terminals wherein the first current generating means first terminal is grounded and its second terminal is electrically connected to the anodes of the first and second diodes;
- a second current generating means having first and second terminals wherein the second current generating means first terminal is grounded and its second terminal is electrically connected to the cathodes of the third and fourth diodes;
- and
- switch control means for gating the first and second FETs of the switching network on and off.
9 more elements
A sample-and-hold circuit comprising:
- a first amplifier having an input terminal and an output terminal;
- a switching ring network having an input terminal and an output terminal and comprised of first, second, third, and fourth legs wherein each leg comprises an FET;
- a first current generating means connected at a first terminal to an external voltage source and connected at a second terminal to the node between the first and second FETs;
- a first means for amplifying an electrical signal having an input and an output, the output being electrically connected to the node between the first and fourth FETs;
- a second means for amplifying an electrical signal having an input electrically connected to the node between the second and third FETs and having an output;
- means for storing an electrical signal electrically connected to the input of the second amplifying means;
- means for controlling the switching ring network having a first terminal connected to the node joining the first and second FETs and the second terminal of the first current generating means, and having a second terminal electrically connected to the node joining the third and fourth FETs and the second terminal of the second current generating means;
- and
- means for discharging the switching ring network having a first terminal electrically connected to the node joining the first and second FETs and having a second terminal electrically connected to the node joining the third and fourth FETs.
6 more elements
Dependencies are inferred from the claim text.