Analysis of emitter (source)-coupled multivibrators

Buonomo, Antonio Riccardo; Schiavo, Alessandro Lo

doi:10.1109/tcsi.2006.875165

Cited by 36 publications

(29 citation statements)

References 10 publications

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“…Two cross-coupled MOS pairs are used. As it is proved in [2], due to the transistors M1, M2 and the load resistances, the equivalent impedance which is seen at the capacitor nodes is given by the resistance R p in parallel with an inductance L. This can be easily deduced by its small signal equivalent circuit, which is shown in Fig. 2.…”

Section: The Design Of a Source-coupled Multivibrator As A Nearly Sinmentioning

confidence: 94%

“…The Source-Coupled multivibrator is studied in [2] and [5] in order to accurately predict the oscillation frequency. In [15] a quadrature cross-coupled oscillator is studied, and the effect of coupling on the phase noise performance and the current consumption is presented.…”

Section: The Design Of a Source-coupled Multivibrator As A Nearly Sinmentioning

confidence: 99%

“…In [15] a quadrature cross-coupled oscillator is studied, and the effect of coupling on the phase noise performance and the current consumption is presented. In [2] it is proved that this oscillator behavior can be either nearly sinusoidal-type or relaxation-type depending on the floating capacitance value, which implies that the poles of the transfer function of the oscillator are either complex conjugate to each other or both real. As the oscillation frequency is increased, the floating capacitance must be decreased.…”

Section: The Design Of a Source-coupled Multivibrator As A Nearly Sinmentioning

confidence: 99%

“…2. The values for R p , L, and C TOTAL , are obtained by solving the following equations (1) and (2). In (1), the predicted oscillation frequency ω 0 for nearly sinusoidal oscillations is given also.…”

Section: The Design Of a Source-coupled Multivibrator As A Nearly Sinmentioning

confidence: 99%

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Ultra-Wideband, Low-Power, Inductorless, 3.1–4.8 GHz, CMOS VCO

Τσίτουρας

Plessas

2010

Circuits Syst Signal Process

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A low-power, inductorless, UWB CMOS voltage controlled oscillator is designed in 0.18 µm CMOS technology targeting to a UWBFM transmitter application. The VCO is a Double-Cross-Coupled Multivibrator and generates output frequencies ranging from 1.55 GHz to 2.4 GHz. A low-power frequency doubler based on a Gilbert cell, which operates in weak inversion, doubles the VCO tuning range from 3.1 GHz to 4.8 GHz. The proportionality between the oscillation frequency and the bias current is avoided in this case for the entire achieved tuning range resulting in a low-power design. The selected architecture provides high suppression, over 45 dB, for the 1 st and 3 rd harmonics, while enabling high-frequency operation and conversion gain due to the unbalanced structure and the single-ended output. The proposed VCO draws 4 mA from a 1.8 V supply, it has a phase noise of −76.7 dBc/Hz at 1 MHz offset from the center frequency, while it exhibits a very high ratio of tuning range (43%) over power consumption equal to 7.76 dB.

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Section: The Design Of a Source-coupled Multivibrator As A Nearly Sinmentioning

confidence: 94%

Section: The Design Of a Source-coupled Multivibrator As A Nearly Sinmentioning

confidence: 99%

Section: The Design Of a Source-coupled Multivibrator As A Nearly Sinmentioning

confidence: 99%

Section: The Design Of a Source-coupled Multivibrator As A Nearly Sinmentioning

confidence: 99%

See 2 more Smart Citations

Ultra-Wideband, Low-Power, Inductorless, 3.1–4.8 GHz, CMOS VCO

Τσίτουρας

Plessas

2010

Circuits Syst Signal Process

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“…The popular emitter (source)-coupled astable multivibrator, whose nonlinear analysis has been recently presented in [1,2], relies on this basic idea [3,4]. It is likewise known that an astable multivibrator can be alternatively realized connecting an inductor across a nonlinear resistor of N -type [3].…”

Section: Introductionmentioning

confidence: 99%

A new CMOS astable multivibrator and its nonlinear analysis

Buonomo¹

2011

Circuit Theory & Apps

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SUMMARYWe present a nonlinear analysis of a new inductively tuned astable multivibrator obtained by connecting a timing inductor across a composite nonlinear resistor with a characteristic of N -type, which is made up of the parallel connection of two complementary pairs of cross-coupled MOS devices. Some possible practical applications of the circuit are also envisaged. Closed-form expressions for the amplitude and the period of the periodic oscillation are derived in both cases when the circuit exhibits a relaxation oscillation and in the more difficult case when, due to the effect of parasitic capacitances of the devices, the circuit has an almost-discontinuous relaxation oscillation with a nonzero switching time. The accuracy of the presented formulas, which are useful for both the analysis and design, is validated through circuit simulations and experimental results.

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A linear, ultra wideband, low‐power, 2.1–5 GHz, VCO

Τσίτουρας

Plessas

Kalivas

2010

Circuit Theory & Apps

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SUMMARYA linear, Ultra Wideband, low-power VCO, suitable for UWB-FM applications is proposed, forming the main part of a UWB-FM transmitter. The VCO is designed in TSMC 90 nm digital CMOS process and includes a Source-Coupled Multivibrator, used as current-controlled oscillator (CCO) which generates output frequencies between 2.1 and 5 GHz and a voltage-to-current (V-to-I) converter which translates the VCO input voltage modulation signal to current. Two single-ended inverter buffers are employed to drive either a differential or a single-ended UWB antenna. The presented VCO is designed for 1 V power supply and exhibits a linear tuning range of 2.1-5 GHz, a differential output power of −7.83 dBm±0.78 dB and low power consumption of 8.26 mW, including the output buffers, at the maximum oscillation frequency. It is optimized for a very high ratio of tuning range (81.69%) over power consumption equal to 9.95 dB. The desired frequency band of 3.1-5 GHz for UWB-FM applications is covered for the entire industrial temperature range (−40 to 125 • C).

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Analysis of emitter (source)-coupled multivibrators

Cited by 36 publications

References 10 publications

Ultra-Wideband, Low-Power, Inductorless, 3.1–4.8 GHz, CMOS VCO

Ultra-Wideband, Low-Power, Inductorless, 3.1–4.8 GHz, CMOS VCO

A new CMOS astable multivibrator and its nonlinear analysis

A linear, ultra wideband, low‐power, 2.1–5 GHz, VCO

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