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EP0133724A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

High-frequency amplifier with distortion compensation

Assignee: Koninklijke Philips NV
•
Filing: 1984-07-30
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Granted: —
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Expires: 2004-07-30
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Abstract

Abstract HF-amplifier device comprising a first transistor which is controlled at its base by a signal source and whose collector is connected to a load, also comprising a second transistor for compensating for the distortion occurring in the first transistor. According to the invention, this distortion is measured by comparing the collector output voltage of the first transistor with the collector voltage of a so-called third transistor, which is highly linearized by means of negative emitter feedback and which evidences a similar voltage gain as the first transistor and whose base is coupled to the base of the first transistor. Said distortion is thereafter compensated for in the forward direction by using the collector difference voltage of the first and third transistor as a control voltage for a second transistor which is connected to the load as an emitter follower. This results at the same time in a low output impedance of the HF-amplifier device.

Inventors

  • 👤 Bruce Tuch

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 02:16
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3211; H03F1/3223; H03F3/00; H03F3/189; H03F3/19

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 114 words
An HF-anplifier device comprising a first transistor which is controlled at its base by a signal source and whose collector constitutes the output of the HF-amplifier device and is connected to a load, also comprising a second transistor and a third transistor with negative emitter feedback whose base is coupled to the base of the first transistor, the second transistor being coupled as an emitter follower to the collector of the third transistor and coupled through its emitter to the collector of the first transistor and through its collector to a supply voltage, characterized in that the voltage gain of the first transistor is substantially equal to the voltage gain of the third transistor.
Claim 2
Dependent Claim 114 words
An HF-anplifier device comprising a first transistor which is controlled at its base by a signal source and whose collector constitutes the output of the HF-amplifier device and is connected to a load, also comprising a second transistor and a third transistor with negative emitter feedback whose base is coupled to the base of the first transistor, the second transistor being coupled as an emitter follower to the collector of the third transistor and coupled through its emitter to the collector of the first transistor and through its collector to a supply voltage, characterized in that the voltage gain of the first transistor is substantially equal to the voltage gain of the third transistor.
Claim 3
Dependent Claim 40 words
An HF-anplifier device as claimed in Claim 1, characterized by fourth, fifth and sixth transistors which are balanced relative to the respective first, second and third transistors, the load being connected between the collectors of the first and fourth transistor.
Claim 4
Dependent Claim 19 words
An amplifier device as claimed in Claim 2, characterized in that the load is formed by an acoustic filter.

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