Title :
A 2-V 1.9-GHz Si down-conversion mixer with an LC phase shifter
Author :
Komurasaki, Hiroshi ; Sato, Hisayasu ; Sasaki, Nagisa ; Miki, Takahiro
Author_Institution :
Syst. LSI Lab., Mitsubishi Electr. Corp., Hyogo, Japan
fDate :
5/1/1998 12:00:00 AM
Abstract :
This paper describes a 2.0-V 1.9-GHz silicon down-conversion mixer with an LC phase shifter in a 20-GHz bipolar process. In this circuit, the lower emitter-coupled pair in a Gilbert cell mixer is removed to enable low voltage operation, and instead an LC phase shifter is inserted between two current sources. The time constant of the LC phase shifter has to be optimized, because the phase shifter acts as a low-pass filter and the lower cutoff frequency results in the loss of signal power. By this optimization, it can keep both high conversion gain and low distortion. The experimental results show conversion gain of 7.0 dB and the input third-order intercept point of -1.0 dBm are realized at 2.0 V
Keywords :
UHF integrated circuits; UHF mixers; UHF phase shifters; bipolar analogue integrated circuits; circuit optimisation; elemental semiconductors; mobile radio; silicon; 0.8 micron; 1.9 GHz; 2 V; 20 GHz; 7 dB; Gilbert cell; LC phase shifter; Si; Si down-conversion mixer; bipolar process; high conversion gain; low distortion; low voltage operation; low-pass filter; time constant optimization; Analog integrated circuits; Batteries; Costs; Cutoff frequency; Low pass filters; Low voltage; Mixers; Phase shifters; Radio frequency; Silicon devices;
Journal_Title :
Solid-State Circuits, IEEE Journal of
