Superregenerative oscillator RF receiver with differential output
First Claim
1. A superregenerative oscillator for use in a superregenerative receiver, comprising:
- a bipolar transistor connected in a tunable circuit to provide a demodulated differential output in response to RF energy being applied thereto, said differential output comprising a collector output and an emitter output, with said collector output being of opposite phase relative to said emitter output;
wherein said oscillator is self-quenching and wherein;
said transistor has a collector, base and emitter, with an input being connected to said collector and to said emitter via a capacitor;
said collector being connected to said collector output via a tunable inductor in parallel with a first capacitor;
said emitter being connected to said emitter output via a second inductor and to said collector via a second capacitor;
said base being connected to said emitter output via a second capacitor and to a source of biasing voltage;
said collector output being connected to said emitter output via a third capacitor.
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Accused Products
Abstract
A superregenerative oscillator RF receiver having a differential output that has the advantage of providing an improved operating range and increased receiver sensitivity without affecting receiver cost or current requirements. The present invention comprises a receiver that has a super-regenerative oscillator from which the demodulated output is taken in differential form. This is achieved by generating collector and emitter output signals, low pass filtering both signals, and then combining them in a difference amplifier. The resulting waveform contains approximately twice the signal content than would be yielded from a singled-ended circuit. The preferred embodiment of present invention can also achieve quench noise cancellation with proper layout and the use of a common mode low pass filter followed by a difference amplifier.
28 Citations
12 Claims
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1. A superregenerative oscillator for use in a superregenerative receiver, comprising:
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a bipolar transistor connected in a tunable circuit to provide a demodulated differential output in response to RF energy being applied thereto, said differential output comprising a collector output and an emitter output, with said collector output being of opposite phase relative to said emitter output;
wherein said oscillator is self-quenching and wherein;
said transistor has a collector, base and emitter, with an input being connected to said collector and to said emitter via a capacitor;
said collector being connected to said collector output via a tunable inductor in parallel with a first capacitor;
said emitter being connected to said emitter output via a second inductor and to said collector via a second capacitor;
said base being connected to said emitter output via a second capacitor and to a source of biasing voltage;
said collector output being connected to said emitter output via a third capacitor.
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2. A superregenerative oscillator for use in a superregenerative receiver, comprising:
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a bipolar transistor connected in a tunable circuit to provide a demodulated differential output in response to RF energy being applied thereto, said differential output comprising a collector output and an emitter output, with said collector output being of opposite phase relative to said emitter output;
said transistor has a collector, base and emitter, with an input being connected to said collector and to said emitter via a capacitor;
said collector being connected to said collector output via a tunable inductor in parallel with a first capacitor;
said emitter being connected to said emitter output via a second inductor, and to said collector via a second capacitor;
said base being connected to a quench oscillator. - View Dependent Claims (3)
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4. A receiver for generating a demodulated output signal for controlling an operating element in response to detecting a transmitted RF signal, comprising:
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an input filter for filtering an RF signal applied thereto;
a superregenerative oscillator comprising a bipolar transistor connected in circuit to produce a collector signal and an emitter signal;
a low pass filter connected to said oscillator for canceling symmetrical quench frequency voltage components of said emitter and collector signals;
an amplifier for combining said collector and emitter signals to produce a single-ended output signal; and
,a data comparator for demodulating said amplifier output signal and producing a receiver output signal for controlling the operating element. - View Dependent Claims (5, 6, 7, 8)
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9. A receiver for generating a demodulated output signal for controlling an operating element in response to detecting a transmitted RF signal, comprising:
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an input filter for filtering an RF signal applied thereto;
a superregenerative oscillator comprising a bipolar transistor connected in a tunable circuit to provide a demodulated differential output in response to RF energy being applied thereto, said differential output comprising a collector output and an emitter output, with said collector output being of opposite phase relative to said emitter output;
a low pass filter connected to said oscillator for canceling symmetrical quench frequency voltage components of said emitter and collector outputs;
an amplifier for combining said collector and emitter outputs to produce a single-ended output; and
,a data comparator for demodulating said amplifier output and producing a receiver output for controlling the operating element. - View Dependent Claims (10, 11, 12)
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Specification