Invention Grant
US09590572B2 Logarithmic detector amplifier system for use as high sensitivity selective receiver without frequency conversion 有权
对数检波器放大器系统用作高灵敏度选择接收器,无需频率转换

Logarithmic detector amplifier system for use as high sensitivity selective receiver without frequency conversion
Abstract:
A logarithmic detector amplifying (LDA) system is provided for use as a high sensitivity receive booster or replacement for a low noise amplifier in a receive chain of a communication device. The LDA system includes an amplifying circuit configured to receive an input signal having a first frequency and generate an oscillation based on the input signal, a sampling circuit coupled to the amplifying circuit and configured to terminate the oscillation based on a predetermined threshold to periodically clamp and restart the oscillation to generate a series of pulses modulated by the oscillation and by the input signal, and one or more resonant circuits coupled with the amplifying circuit and configured to establish a frequency of operation and to generate an output signal having a second frequency, the second frequency being substantially the same as the first frequency.
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