Controllable amplifier and the use thereof
First Claim
Patent Images
1. A controllable amplifier comprising:
- a first input for supplying a radiofrequency input signal;
a second input for supplying a control signal for gain;
an output; and
a current path connected between a supply potential connection and a reference potential connection, wherein the current path comprises;
an amplifier transistor having a first connection coupled to the reference potential connection, a second connection, and a control input coupled to the first input; and
a cascode transistor having a control input coupled to the second input, a first connection coupled to the second connection of the amplifier transistor, and a second connection coupled to the output.
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Abstract
A controllable amplifier amplifies a radiofrequency input signal on the basis of a control signal. A current path is formed between a supply potential connection and a reference potential connection. The current path includes an amplifier transistor and a cascode transistor, the cascode transistor being connected to the input for supplying the control signal. The output power of the amplifier is controlled using the cascode transistor, as a result of which a low power consumption is achieved in conjunction with good noise properties.
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Citations
20 Claims
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1. A controllable amplifier comprising:
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a first input for supplying a radiofrequency input signal;
a second input for supplying a control signal for gain;
an output; and
a current path connected between a supply potential connection and a reference potential connection, wherein the current path comprises;
an amplifier transistor having a first connection coupled to the reference potential connection, a second connection, and a control input coupled to the first input; and
a cascode transistor having a control input coupled to the second input, a first connection coupled to the second connection of the amplifier transistor, and a second connection coupled to the output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A controllable amplifier comprising:
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first and second amplifier transistors having inputs that receive a differential input signal and first and second connections;
first and second cascode transistors having inputs that receive a differential control signal and first and second connections;
wherein the first connection of the first amplifier transistor is connected to the second connection of the first cascode transistor and the first connection of the second amplifier transistor is connected to the second connection of the second cascode transistor; and
wherein the second connection of the first cascode amplifier transistor and the second connection of the second cascode amplifier transistor provide a differential output signal. - View Dependent Claims (12, 13, 14, 15)
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16. A controllable amplifier comprising:
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one or more amplifier transistors that receive an input signal and generate an amplified input signal; and
one or more cascode transistors that receive the amplified input signal from the one or more amplifier transistors and a varied level control signal and generate an output signal; and
wherein the output signal has an output power according to the varied level control signal. - View Dependent Claims (17, 18, 19, 20)
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Specification