US3810256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor amplifier for broad-band information signals
Assignee: US Philips Corp
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Filing: 1973-02-28
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Granted: 1974-05-07
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Expires: 1993-02-28
Abstract
Abstract A broad-band transistor amplifier comprising a negative feedback circuit for maximum negative feedback as well as a circuit with which in the manner of a negative feedback exclusively the distortion products occurring in the output signal of the amplifier are subjected to a feedback for the purpose of additionally reducing these distortion products. To this end the transistor amplifier includes a cascade arrangement of two impedances whose common connection point is connected to the input of a phase inverter stage which injects the distortion products in phase opposition into the output circuit of the amplifier.
Inventors
- 👤 Doorn W Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:27
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/189; H03F3/19; H03F3/20; H03F3/21
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
268 words
A transistor amplifier for amplifying a supplied information signal and comprising a pre-amplifier stage including, an input for receiving said signal, a common collector pre-amplifier output stage, the output signal derived from the emitter circuit of the transistor of the pre-amplifier output stage being applied to the base electrode of a transistor arranged in common emitter configuration and incorporated in a control amplifier stage for an amplifier end stage, said control amplifier stage following the pre-amplifier stage; said amplifier end stage being formed as a power amplifier stage and being constituted by a transistor arranged in common collector configuration, the output circuit of the transistor in the amplifier end stage being constituted by the emitter circuit and being coupled at one end to a load and at the other end to a negative feedback circuit which is also connected to the input of the pre-amplifier stage, characterized in that a potential divider whose potential divider point corresponds to the information signal zero point is connected between the emitter circuit of the transistor incorporated in common collector configuration in the pre-amplifier output stage and a connection point in the output of the common collector transistor in the power amplifier end stage having a phaseopposed information signal voltage, said transistor amplifier being furthermore provided with an amplifier stage operating as a phase inverter stage whose input is connected to the potential divider point of the potential divider and whose output is connected in the manner of a negative feedback circuit to an impedance in the emitter circuit of the transistor incorporated in common emitter configuration in the control amplifier stage.
Claim 2
Dependent Claim
268 words
A transistor amplifier for amplifying a supplied information signal and comprising a pre-amplifier stage including, an input for receiving said signal, a common collector pre-amplifier output stage, the output signal derived from the emitter circuit of the transistor of the pre-amplifier output stage being applied to the base electrode of a transistor arranged in common emitter configuration and incorporated in a control amplifier stage for an amplifier end stage, said control amplifier stage following the pre-amplifier stage; said amplifier end stage being formed as a power amplifier stage and being constituted by a transistor arranged in common collector configuration, the output circuit of the transistor in the amplifier end stage being constituted by the emitter circuit and being coupled at one end to a load and at the other end to a negative feedback circuit which is also connected to the input of the pre-amplifier stage, characterized in that a potential divider whose potential divider point corresponds to the information signal zero point is connected between the emitter circuit of the transistor incorporated in common collector configuration in the pre-amplifier output stage and a connection point in the output of the common collector transistor in the power amplifier end stage having a phaseopposed information signal voltage, said transistor amplifier being furthermore provided with an amplifier stage operating as a phase inverter stage whose input is connected to the potential divider point of the potential divider and whose output is connected in the manner of a negative feedback circuit to an impedance in the emitter circuit of the transistor incorporated in common emitter configuration in the control amplifier stage.
Claim 3
Dependent Claim
44 words
A transistor amplifier as claimed in claim 1, characterized in that the potential divider is connected to the connection point of the output circuit of the amplifier end stage and the negative feedback circuit which is connected to the input of the pre-amplifier stage.
Claim 4
Dependent Claim
58 words
A transistor amplifier as claimed in claim 1, characterized in that the potential divider is constituted by a resistor incorporated between the potential divider point and the output of the amplifier end stage and by a series arrangement of a resistor and an inductor incorporated between the potential divider point and the output of the pre-amplifier output stage.
Claim 5
Dependent Claim
62 words
A transistor amplifier as claimed in claim 1, characterized in that the amplifier stage also operating as a phase inverter stage is constituted by a transistor arranged in common emitter configuration whose base is connected to the potential divider point of the potential divider and whose collector is connected to the said impedance in the emitter circuit of the control amplifier stage.
Claim 6
Dependent Claim
76 words
A transistor amplifier as claimed in claim 4, characterized in that the emitter circuit of the transistor incorporated in common emitter configuration in the phase inverter stage includes a frequency-dependent negative feedback circuit constituted by a resistor and a series arrangement of a capacitor and an inductor connected in parallel with said resistor, said frequency-dependent negative feedback circuit reducing the amplification of the phase inverter stAge for frequencies located outside the operating range of the amplifier.
Claim 7
Dependent Claim
205 words
A circuit for amplifying an input information signal comprising an input section having an input means for receiving said input signal and an output means having a selected output impedance; an output amplifier section having a first input means coupled to said input section output means, a second input means having a selected input impedance, and an output means for supplying an amplified input signal to a load; a first negative feedback loop coupled between said input section input means and said output section output means; a second negative feedback loop comprising a potential divider coupled between said input section output means and said output section output means, said divider having an input impedance substantially greater than said input section output means impedance and a potential divider point means at a zero potential information signal for supplying a distortion signal from said output section and an output means coupled to said output section second input means and having an output impedance substantially greater than said output section second input means impedance for applying said distortion signal in a phase polarity to cancel the distortion in said output section; whereby said second feedback loop does not cause information signal feedback and the loops are mutually decoupled.
Claim 8
Dependent Claim
205 words
A circuit for amplifying an input information signal comprising an input section having an input means for receiving said input signal and an output means having a selected output impedance; an output amplifier section having a first input means coupled to said input section output means, a second input means having a selected input impedance, and an output means for supplying an amplified input signal to a load; a first negative feedback loop coupled between said input section input means and said output section output means; a second negative feedback loop comprising a potential divider coupled between said input section output means and said output section output means, said divider having an input impedance substantially greater than said input section output means impedance and a potential divider point means at a zero potential information signal for supplying a distortion signal from said output section and an output means coupled to said output section second input means and having an output impedance substantially greater than said output section second input means impedance for applying said distortion signal in a phase polarity to cancel the distortion in said output section; whereby said second feedback loop does not cause information signal feedback and the loops are mutually decoupled.
Claim 9
Dependent Claim
30 words
A circuit as claimed in claim 6 wherein said output section output means comprises a common point and said first and second feedback loops are coupled to said common point.
Claim 10
Dependent Claim
41 words
A circuit as claimed in claim 6 wherein said divider comprises a resistor coupled to said output section output means and a series circuit coupled between said resistor and said input stage output means and comprising a resistor and an inductor.
Claim 11
Dependent Claim
50 words
A circuit as claimed in claim 6 wherein said output amplifier section comprises a transistor control amplifier having a base and said second loop comprises a common emitter phase inverter transistor amplifier having a base coupled to said potential divider point and a collector coupled to said control transistor emitter.
Claim 12
Dependent Claim
67 words
A circuit as claimed in claim 9 wherein said sections have an operating range, and further comprising means for reducing the amplification of said phase inverter transistor for frequencies outside said range comprising a frequency dependent negative feedback circuit coupled to said emitter of said phase inverter transistor and including a resistor and a series circuit parallel coupled to said resistor including a capacitor and an inductor.
References Cited (Backward Citations)
US3525052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |