A High Frequency Low Noise Acoustic STW VCO
Fleischmann B, Russer P, Schaller A, Weigel R (1989)
Publication Type: Conference contribution
Publication year: 1989
Pages Range: 1015-1020
Conference Proceedings Title: 19th European Microwave Conference, 1989
Event location: London, UK
Abstract
A voltage controlled oscillator (VCO) at 2.65 GHz has been developed using acoustic surface transverse wave (STW) delay lines operating at the fifth harmonic as the frequency controlling element. A filter with three transducers has been designed. The STW filter also serves as the oscillator output coupler. Compared to a microstrip coupler, the spectral characteristic of the oscillator is strongly improved due to the high selectivity of the transducer type coupler. The Q value and the untuned insertion loss of the filter were 3600 and 30 dB, respectively. A very thin metallization of only 25 nm aluminum was used for the STW filter. Excellent phase noise data have been measured. A single-sideband phase noise to carrier ratio of ¿93 dBc/Hz at 1 kHz and ¿63 dBc/Hz at 100 Hz was attained. As a phase shifter, a GaAs varactor diode circuit is used. Tuning range and output power of the oscillator were ± 375 kHz and 3 dBm, respectively. The load pulling (frequency stability) is ± 3.5 kHz at 12 dB return loss. Attenuation of harmonics is higher than 44 dB referred to the carrier.
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APA:
Fleischmann, B., Russer, P., Schaller, A., & Weigel, R. (1989). A High Frequency Low Noise Acoustic STW VCO. In 19th European Microwave Conference, 1989 (pp. 1015-1020). London, UK.
MLA:
Fleischmann, Bernd, et al. "A High Frequency Low Noise Acoustic STW VCO." Proceedings of the 19th European Microwave Conference, 1989, London, UK 1989. 1015-1020.
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