EP0977352A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Noise figure and linearity improvement technique using shunt feedback
Assignee: Koninklijke Philips NV
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Filing: 1999-07-21
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Granted: —
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Expires: 2019-07-21
Abstract
Abstract A shunt-feedback technique is provided for improving noise figure and linearity of electronic circuits, such as amplifiers and mixers. An input common-emitter transconductance stage of an electronic circuit has a transistor, and a degeneration impedance provided between the emitter of the transistor and a ground terminal. A feedback capacitor is connected between the collector and the base of the transistor. A feedback resistor is coupled between the collector of the transconductance stage transistor and the emitter of a transistor in the next stage of the electronic circuit. The feedback capacitor and the feedback resistor form a shunt-feedback network.
Inventors
- 👤 Keng Leong Fong
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:54
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/08; H03F1/22; H03F1/32; H03F2200/00; H03F2200/294; H03F2200/372
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
75 words
An electronic circuit comprising: an input for receiving an input signal and an output, a transconductance stage coupled to said input for transforming power of the input
signal into current, a second stage coupled between said transconductance stage and said output, and a shunt-feedback network for establishing a signal flow path between said input and a
point between said transconductance stage and said second stage to improve linearity and noise
figure of said electronic circuit.
Claim 2
Dependent Claim
21 words
The electronic circuit of claim 1, wherein said transconductance stage comprises a first
transistor having a base coupled to said input.
Claim 3
Dependent Claim
27 words
The electronic circuit of claim 2, wherein said transconductance stage further comprises
a degeneration impedance coupled between an emitter of the first transistor and a ground
terminal.
Claim 4
Dependent Claim
14 words
The electronic circuit of claim 3, wherein said shunt-feedback network comprises a
feedback capacitor.
Claim 5
Dependent Claim
23 words
The electronic circuit of claim 4, wherein said shunt-feedback network further
comprises a feedback resistor between said transconductance stage and said second stage.
Claim 6
Dependent Claim
22 words
The electronic circuit of claim 5, wherein said second stage comprises a second
transistor having an emitter coupled to said feedback resistor.
Claim 7
Dependent Claim
24 words
The electronic circuit of claim 6, wherein said second transistor is arranged in a
cascode configuration to isolate said output from said transconductance stage.
Claim 8
Dependent Claim
24 words
The electronic circuit of claim 7, wherein said second transistor has a base supplied
with bias voltage and a collector coupled to said output.
Claim 9
Dependent Claim
24 words
The electronic circuit of claim 5, wherein said second stage comprises at least one
switching element coupled between said feedback resistor and said output.
Claim 10
Dependent Claim
33 words
The electronic circuit of claim 9, wherein said switching element is controlled by a
signal from a local oscillator to produce an output signal having frequency different from
frequency of said input signal.
Claim 11
Dependent Claim
39 words
The electronic circuit of claim 10, wherein said switching element comprises a
switching transistor having an emitter coupled to said feedback resistor, a base supplied with
said signal from the local oscillator, and a collector coupled to said output.
Claim 12
Dependent Claim
85 words
An amplifier comprising: an input terminal for receiving an input signal to be amplified, a transconductance stage coupled to said input terminal for transforming power of the
input signal into current, a cascode stage coupled to said transconductance stage to isolate an output terminal of
said amplifier from said transconductance stage, and a shunt-feedback network for establishing a signal flow path between said input
terminal and a point between said transconductance stage and said cascode stage for improving
linearity and noise figure of said amplifier.
Claim 13
Dependent Claim
18 words
The amplifier of claim 12, wherein said shunt-feedback network comprises a feedback
capacitor coupled to said input terminal.
Claim 14
Dependent Claim
22 words
The amplifier of claim 13, wherein said shunt-feedback network further comprises a
feedback resistor between said transconductance stage and said cascode stage.
Claim 15
Dependent Claim
21 words
The amplifier of claim 14, wherein said transconductance stage comprises a first
transistor having a base connected to said input terminal.
Claim 16
Dependent Claim
26 words
The amplifier of claim 15, wherein said transconductance stage further comprises a
degeneration impedance connected between an emitter of said first transistor and a ground
terminal.
Claim 17
Dependent Claim
35 words
The amplifier of claim 16, wherein said cascode stage comprises a second transistor
having an emitter coupled to said feedback resistor, a base supplied wit bias voltage, and a
collector coupled to said output terminal.
Claim 18
Dependent Claim
77 words
An electronic circuit comprising: an input terminal for receiving a first signal having first frequency, a transconductance stage for transforming power of said first signal to current, a switching stage controlled by a second signal having second frequency for producing
an output signal having output frequency different from said first frequency, and a shunt-feedback network coupled between said input terminal and an input of said
switching stage for improving linearity and noise figure of said mixer circuit.
Claim 19
Dependent Claim
31 words
The electronic circuit of claim 18, wherein said shunt-feedback network comprises a
feedback capacitor coupled to said input terminal, and a feedback resistor between said
transconductance stage and said switching stage.
Claim 20
Dependent Claim
30 words
The electronic circuit of claim 19, wherein said switching stage comprises a pair of
switching transistors having emitters coupled to said feedback resistor, and bases supplied with
said second signal.
References Cited (Backward Citations)
No citation records indexed.
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