Direct downconversion with switching CMOS mixer

Pihl, J.; Christensen, K.T.; Bruun, Erik

doi:10.1109/iscas.2001.921802

Cited by 18 publications

(12 citation statements)

References 7 publications

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“…We present applications of the new technique to balanced and unbalanced switching mixer circuits for direct-conversion receivers, similar to those reported recently in [7,11]. We are able to obtain, directly, time-domain waveforms for sections of bit streams downconverted to baseband.…”

Section: Introductionmentioning

confidence: 84%

A time-domain RF steady-state method for closely spaced tones

Roychowdhury¹

2002

Proceedings of the 39th Conference on Design Automation - DAC '02

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Verifying circuits with two or more closely-spaced driving frequencies is important in RF and wireless communications, e.g., in the design of down-conversion mixers. Existing steady-state calculation methods, like harmonic balance, rely on Fourier series expansions to find the difference-frequency components typically of interest. Time-domain methods are, however, better suited for circuits with strong nonlinearities such as switching. Towards this end, we present a purely time-domain method for direct computation of difference tones in closely-spaced multi-tone problems. Our approach is based on multiple artificial time scales for decoupling the tones driving the circuit. Our method relies on a novel multi-time reformulation that expresses circuit equations directly in terms of time-scales corresponding to difference tones. We apply the new technique to an RF-CMOS mixer to predict baseband bit-streams and down-conversion gain and distortion, in two orders of magnitude less CPU time than traditional time-stepping simulation.

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Section: Introductionmentioning

confidence: 84%

A time-domain RF steady-state method for closely spaced tones

Roychowdhury¹

2002

Proceedings of the 39th Conference on Design Automation - DAC '02

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“…This underscores the importance of paying careful attention to envelope initial conditions, even when the envelope solution is slowly varying and appears reasonable at first sight. Figure 11: Balanced CMOS down-conversion mixer [10] The circuit shown in Figure 11 is a balanced direct-downconversion mixer adapted from [15]. An important feature of this circuit is that the lower pair of MOSFETs constitutes a frequency doubler, generating a current at twice the LO frequency.…”

Section: Exploiting Artificial Numerical Dampingmentioning

confidence: 99%

Making Fourier-envelope simulation robust

Roychowdhury¹

2002

Proceedings of the 2002 IEEE/ACM International Conference on Computer-Aided Design - ICCAD '02

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Fourier-envelope algorithms are an important component of the mixed-signal/RF verification toolbox. In this paper, we address the unpredictability and lack of robustness that has been reported for these algorithms. We show that the problem stems from fast oscillations in envelopes that are expected to be slowly varying. We demonstrate that this is related to the fact that the envelope equations are always stiff, whether or not the underlying system is. We show that careful choice of envelope initial conditions is necessary to obtain useful solutions, and propose two techniques for finding good initial conditions. Applying these, and solving the envelope equations with stifflystable numerical methods, we improve the robustness and reliability of Fourier-envelope methods. We illustrate the new methods with a direct-downconversion mixer circuit.

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“…A mixer is a three-port device consisting of LO (local oscillator), RF IN (radio frequency input) and IF OUT (intermediate frequency output) ports. LO port is driven by a local oscillator, which is a fixed amplitude large signal [5]. Up conversion mixer in the transmitter chain translates incoming low frequency into a high frequency to be feed to transmitting antenna.…”

Section: Introductionmentioning

confidence: 99%

A 2.4 GHz double balanced differential input single output low power transmitting mixer In TSMC 180nm CMOS RF process

Patil¹,

Kanphade²

2015

2015 2nd International Conference on Electronics and Communication Systems (ICECS)

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In this paper, a high gain low-power upconversion Gilbert cell mixer, designed in 180nm RF CMOS process, is proposed to realize the transmitter front-end working at 2.4 GHz frequency. The proposed mixer can convert a 100 MHz intermediate frequency (IF) signal into a 2.4 GHz RF signal, with a local oscillator power of 5 dBm at 2.3 GHz. A comparison with conventional other up-conversion mixers shows high performance. Simulation results demonstrate that at 2.4 GHz, the circuit provides 28.40 dB of conversion gain and the input-referred third-order intercept point (IIP3) of -17.78 dBm. The circuit consumed 8.660mW power and it is laid out using Cadence Virtuoso layout editor of size 0.229mmx0.205mm.

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Direct downconversion with switching CMOS mixer

Cited by 18 publications

References 7 publications

A time-domain RF steady-state method for closely spaced tones

A time-domain RF steady-state method for closely spaced tones

Making Fourier-envelope simulation robust

A 2.4 GHz double balanced differential input single output low power transmitting mixer In TSMC 180nm CMOS RF process

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