| Autor: |
Long He, Lianming Li, Xu Wu, Zhigong Wang |
| Jazyk: |
angličtina |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
IEEE Access, Vol 6, Pp 61826-61832 (2018) |
| Druh dokumentu: |
article |
| ISSN: |
2169-3536 |
| DOI: |
10.1109/ACCESS.2018.2875764 |
| Popis: |
This paper presents a two-channel (I+Q) variable gain amplifier (VGA) for low power 60-GHz wireless receiver. The VGA consists of four-stage gain cells, an efficient DC-offset cancelling circuit and an output buffer for test purposes. To achieve wide bandwidth and low power consumption, a modified Cherry-Hooper amplifier gain cell is used. With a tunable transistor and its parasitic capacitance, a dB-linear characteristic and a flat gain response are achieved without any additional exponential circuit. The DC-offset is cancelled effectively with two proposed feedback loops. The measurement results show that the VGA achieves a gain range of 6 to 44 dB, an OP1dB of 1 dBm, and a 3-dB bandwidth of over 1 GHz with an excellent flat gain response. Fabricated in a 65-nm CMOS technology, the two-channel VGA core occupies a silicon area of only 0.055 mm2 and consumes only 10 mA from a 1.2 V power supply. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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