Details

Autor(en) / Beteiligte

• Daquan Huang
• LaRocca, T.R.
• Chang, M.-C.F.
• Samoska, L.
• Fung, A.
• Campbell, R.L.
• Andrews, M.

Titel

Terahertz CMOS Frequency Generator Using Linear Superposition Technique

Ist Teil von

• IEEE journal of solid-state circuits, 2008-12, Vol.43 (12), p.2730-2738

Ort / Verlag

New York, NY: IEEE

Erscheinungsjahr

2008

Quelle

IEEE/IET Electronic Library (IEL)

Beschreibungen/Notizen

• A low Terahertz (324 GHz) frequency generator is realized in 90 nm CMOS by linearly superimposing quadruple (N=4) phase shifted fundamental signals at one fourth of the output frequency (81 GHz). The developed technique minimizes the fundamental, second and third order harmonics without extra filtering and results in a high fundamental-to-4 th harmonic signal conversion ratio of 0.17 or -15.4 dB. The demonstrated prototype produces a calibrated -46 dBm output power when biased at 1 V and 12 mA with 4 GHz tuning range and extrapolated phase noise of -91 dBc/Hz at 10 MHz frequency offset. The linear superposition (LS) technique can be generalized for all even number cases (N=2k, where k=1,2,3,4,...,n) with different tradeoffs in output power and frequency. As CMOS continues to scale, we anticipate the LS N=4 VCO to generate signals beyond 2 Terahertz by using 22 nm CMOS and produce output power up to -1.5 dBm with 1.7% power added efficiency with an LS VCO + Class-B Power Amplifier cascaded circuit architecture.