Low temperature and low noise factor amplifying circuit
Title：
Low temperature and low noise factor amplifying circuit
Application Number：
 200310115391
Application Date：
 2003/11/21
Announcement Date：
 2004/11/10
Pub. Date：
Publication Number：
 1545214
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 H04B 1/10
Applicant(s)：
 Tsinghua University
Inventor(s)：
 Cao Bisong, Zhang Xiaoping, Gao Fei
Key Words：
 Low temperature, noise factor, amplifying circuit
Abstract：
 The invention is a low-temperature extremely low-noise coefficient amplifying circuit and its character: it adopts microband mixing circuit, adopts high-Q value spiral inductance coil and high-Q value capacitor in the input matching network in order to reduce input circuit loss and then noise; the spiral inductance coil's two ends adopts double parallel microbnd line structure, reducing parasitic parameters; the microband length of the negative feedback network is less than 1/10 working wavelength, reducing parasitic vibration; it adopts small resistances in input and output matching networks, enhancing value of real part of impedance; in the output matching network, the resistances in series with main lines and branch lines are proper to make the gain larger; the input and output matching networks is connected to 1/4 working wavelength branch lines, reducing circuit size to make the circuit able to work at low temperature for a long period. It can meet the requirements of low noise, larger gain, low standing wave ratio, working at low temperature for a long time, etc.
Claim：
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