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Proceedings Paper

Low-noise InP HEMT amplifier
Author(s): Nianhua Jiang; Stephane Claude; Keith Yeung; Dominic Garcia
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Paper Abstract

This paper describes the development of a 3-stage cryogenic low noise InP HEMT amplifier for ALMA Band 3 receivers. A detailed design is given using Hughes 0.1 μm low noise InP HEMTs for producing a low power dissipation amplifier, < 9 mW. The amplifier design uses a hybrid circuit in order to provide the flexibility for optimizing the active devices and passive components. The optimal impedance matching for low noise and low input return loss were obtained by computer aided simulation to achieve 5 K noise temperature, 36 dB gain, flatness ±1 dB and -10 dB input return loss at 12 degrees Kelvin in the 4-9 GHz band. The amplifier will be used as a cold IF preamplifier with a SIS mixer in the Band 3 receivers now being constructed for the Atacama Large Millimetre Array (ALMA).

Paper Details

Date Published: 28 September 2004
PDF: 10 pages
Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); doi: 10.1117/12.551019
Show Author Affiliations
Nianhua Jiang, Herzberg Institute of Astrophysics, NRC (Canada)
Stephane Claude, Herzberg Institute of Astrophysics, NRC (Canada)
Keith Yeung, Herzberg Institute of Astrophysics, NRC (Canada)
Dominic Garcia, Herzberg Institute of Astrophysics, NRC (Canada)

Published in SPIE Proceedings Vol. 5489:
Ground-based Telescopes
Jacobus M. Oschmann Jr., Editor(s)

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