High voltage, high frequency amplifier circuit
First Claim
1. High frequency amplifying circuitry comprisingan input connection;
- an output connection;
first and second transistors each having gate, drain, and source electrodes;
input means coupling said input connection to the gate electrode of the first transistor and to the gate electrode of the second transistor, said input means including a first dc blocking capacitance between the gate electrode of the first transistor and the gate electrode of the second transistor and preventing the flow of dc current between the gate electrode of the first transistor and the gate electrode of the second transistor;
output means coupling the drain electrode of the first transistor and the drain electrode of the second transistor to said output connection, said output means including a second dc blocking capacitance between the drain electrode of the first transistor and the drain electrode of the second transistor and preventing the flow of dc current between the drain electrode of the first transistor and the drain electrode of the second transistor;
whereby parallel first and second ac conductive paths are provided between the input connection and the output connection through the first transistor and the second transistor, respectively;
a single dc conductive path between a source of operating potential and a reference potential, said path being through the first transistor and the second transistor in series, said path blocking ac current flow therethrough, and said path comprisingmeans including an ac blocking inductance for connecting the drain electrode of the first transistor to said source of operating potential;
means for connecting the source electrode of the second transistor to said reference potential; and
ac blocking inductance means coupling the source electrode of the first transistor to the drain electrode of the second transistor.
1 Assignment
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Accused Products
Abstract
High voltage, high frequency amplifier employing power transistors. The amplifier provides parallel ac signal amplification paths through each transistor and a single dc power path through the transistors in series. In one embodiment two FET'"'"'s have their gate electrodes connected to an input terminal and their drain electrodes connected to an output terminal so as to provide two parallel ac amplifying paths while blocking dc current flow. The drain electrode of the first FET is connected through an RF choke to a source of dc operating potential, and its source electrode is connected through an RF choke to the drain electrode of the second FET. The source electrode of the second FET is connected to ground through a zener diode. A single dc conductive path is thus provided between the source of operating potential and ground through the two FET'"'"'s in series.
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Citations
7 Claims
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1. High frequency amplifying circuitry comprising
an input connection; -
an output connection; first and second transistors each having gate, drain, and source electrodes; input means coupling said input connection to the gate electrode of the first transistor and to the gate electrode of the second transistor, said input means including a first dc blocking capacitance between the gate electrode of the first transistor and the gate electrode of the second transistor and preventing the flow of dc current between the gate electrode of the first transistor and the gate electrode of the second transistor; output means coupling the drain electrode of the first transistor and the drain electrode of the second transistor to said output connection, said output means including a second dc blocking capacitance between the drain electrode of the first transistor and the drain electrode of the second transistor and preventing the flow of dc current between the drain electrode of the first transistor and the drain electrode of the second transistor; whereby parallel first and second ac conductive paths are provided between the input connection and the output connection through the first transistor and the second transistor, respectively; a single dc conductive path between a source of operating potential and a reference potential, said path being through the first transistor and the second transistor in series, said path blocking ac current flow therethrough, and said path comprising means including an ac blocking inductance for connecting the drain electrode of the first transistor to said source of operating potential; means for connecting the source electrode of the second transistor to said reference potential; and ac blocking inductance means coupling the source electrode of the first transistor to the drain electrode of the second transistor. - View Dependent Claims (2, 3, 4, 5)
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6. High frequency amplifying circuitry comprising
an input connection; -
an output connection; a plurality of three or more transistors each having gate, drain, and source electrodes; input means coupling said input connection to the gate electrodes of said plurality of transistors, said input means including first dc blocking capacitances between the gate electrode of each transistor and the gate electrodes of the other transistors of the plurality and preventing the flow of dc current between the gate electrode of each transistor and the gate electrodes of the other transistors of the plurality; output means coupling the drain electrodes of the plurality of transistors to said output connection, said output means including dc blocking capacitances between the drain electrode of each transistor and the drain electrodes of all of the other transistors of the plurality and preventing the flow of dc current between the drain electrode of each transistor and the drain electrodes of the other transistors of the plurality; whereby a plurality of parallel ac amplifying paths are provided between the input connection and the output connection through the plurality of transistors; a single dc conductive path between a source of operating potential and a reference potential, said path being through the plurality of transistors in series, said path blocking ac current flow therethrough, and said path comprising means including an ac blocking inductance for connecting the drain electrode of the first transistor of the plurality of said source of operating potential; means for connecting the source electrode of the last transistor of the plurality to said reference potential; and ac blocking inductance means coupling the source electrode of each transistor of the plurality except the last to the drain electrode of the next transistor of the plurality. - View Dependent Claims (7)
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Specification