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- Andersson Hägglund, Douglas, et al.
(författare)
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Analog Integrated Audio Frequency Synthesizer
- 2016
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Ingår i: IEEE Asia Pacific Conference on Circuits and Systems, APCCAS 2016. - 9781509015702 ; , s. 83-86
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Konferensbidrag (refereegranskat)abstract
- In this paper we present an audio synthesizer that creates audio signals, intended to be reproduced as sound by a loudspeaker. This paper details the design, implementation and verification of an analog, subtractive audio synthesizer. The synthesizer produces a variety of waveforms spanning approximately 3 octaves. The frequency is controlled by an external voltage and the harmonic content is regulated by a tunable filter. The system is fabricated in 130 nm CMOS. Current consumption measures between 1.8 and 2.1 mA from a supply of 1.2 V.
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| 2. |
- TIRED, TOBIAS, et al.
(författare)
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Comparison of two SiGe 2-stage E-band Power Amplifier Architectures
- 2017
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Ingår i: IEEE Asia Pacific Conference on Circuits and Systems, APCCAS 2016. - 9781509015702 ; 13, s. 666-669
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Konferensbidrag (refereegranskat)abstract
- This paper presents simulation and measurement results for two 2-stage E-band power amplifiers implemented in 0.18um SiGe technology with fT = 200 GHz. To increase the power gain by mitigating the effect of the base-collector capacitance, the first design uses a differential cascode topology with a 2.7 V supply voltage. The second design instead uses capacitive cross-coupling of a differential common emitter stage, previously not demonstrated in mm-wave SiGe PAs, and has a supply voltage of only 1.5V. Low supply voltage is advantageous since a common supply can then be shared between the transceiver and the PA. To maximize the power gain and robustness, both designs use a transformer based interstage matching. The cascode design achieves a measured power gain, S21 , of 16 dB at 92 GHz with 17GHz 3-dB bandwidth, and a simulated saturated output power, Psat , of 17 dBm with a 16% peak PAE. The cross-coupled design achieves a measured S21 of 10 dB at 93 GHz with 16 GHz 3-dB bandwidth, and a simulated Psat, of 15 dBm with 16% peak PAE. Comparing the measured and simulated results for the two amplifier architectures, the cascode topology is more robust, while the cross-coupled topology would benefit from a programmable cross-coupling capacitance.
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