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Logarithmic amplifier with universal demodulation capabilities

A technology of logarithmic amplifiers and amplifiers, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, amplifiers with only semiconductor devices, etc., can solve unrealistic problems

Active Publication Date: 2016-02-24
DOCKON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach allows to overcome extremely high attenuation, but this approach requires a DS-SS transmitter which is impractical for many applications
[0015] In RAMAN distributed optical amplifiers, the signal-to-noise ratio (SNR) can be improved and data can be transmitted over hundreds or thousands of kilometers of fiber optic lines with only minimal regeneration, but the solution is limited to optical applications

Method used

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  • Logarithmic amplifier with universal demodulation capabilities
  • Logarithmic amplifier with universal demodulation capabilities
  • Logarithmic amplifier with universal demodulation capabilities

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Embodiment Construction

[0063] LDA, as described in US Patent No. 7,911,235, which is hereby incorporated by reference in its entirety, produces intermittent oscillations that self-quench when a given threshold is reached. The LDA also embeds circuitry for performing direct or indirect AM or PM demodulation. These factors, combined with the fact that the regenerative gain is low, allow this LDA to detect small-amplitude signals buried in noise. The LDA converts analog or digital AM modulated signals and generates trains of nearly constant amplitude and quasi-digital pulses at intermediate frequencies over a wide dynamic range. A digital frequency-to-voltage converter (VFC) can be used to convert the pulse frequency into a digital voltage with simple processing. Alternatively, a simple analog VFC or peak detector can be used to demodulate the input signal to baseband with audio or video bandwidth. The LDA achieves direct AM demodulation, high sensitivity and signal regeneration from noise level, hig...

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Abstract

A logarithmic amplifier (LDA) is described that includes an amplifier configured to oscillate a modulated input signal, a feedback establishing a 180 degree phase shift between the amplifier input and the output and maintaining oscillation of the input signal, a parallel resonant circuit connected to the amplifier output causing the amplifier to resonate at or around a center frequency, and a controller connected to the amplifier input cyclically terminating oscillation of the input signal each time a pre-determined threshold of current is detected, the controller including a low pass filter configured to generate a second output signal having a repetition frequency. The LDA may be used for AM with or without a PLL and / or a superhet AM. The LDA may be implemented as a mixer and used for phase demodulation. The LDA may be used for phase demodulation. The LDA may be used in place of a low noise amplifier.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 61 / 798,521, filed March 15, 2013, entitled "Logarithmic Amplifier with Universal Demodulation Capabilities." technical field [0003] The present disclosure relates to regenerative selective log detector amplifiers (LDAs). Background technique [0004] This disclosure relates to improvements and novel applications for LDA. LDA was first described in US Patent No. 7,911,235. [0005] The LDA of the present disclosure is similar in circuit topology to a Super Regenerative Receiver (SRO) in some respects. SROs are amplitude sensitive regenerative devices. SROs also have external quenching and high gain. SROs were first described in US Patent No. 1,424,065. SROs typically suffer from poor selectivity and higher output noise when used for narrowband signals. When the oscillator is LC based, the SRO also drifts over temperature. SRO receivers were quic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/00
CPCH03D1/18H03D7/02H03D7/12H03D7/165H03D2200/0043H03D2200/0098H03F3/191H03D1/08H03D11/04H03D11/08H01P5/19H01Q7/00H01Q21/0075H03D7/166H03F1/08H03F3/04H03F2200/165H03F2200/294H03G11/04
Inventor 福雷斯特·詹姆斯·布莱恩帕特里克·安托万·拉达亚历山大·迪普伊
Owner DOCKON