A novel VCO topology is proposed that combines the low power of –gm oscillators with the inherent buffering of Colpitts oscillators. Using this topology, a quadrature VCO (QVCO) was implemented in 0.13 μm digital CMOS consuming 32 mW at 20 GHz with just over 10% tuning range. The measured phase noise of the QVCO at 20.17 GHz is -102.41 dBc/Hz at 1 MHz offset. Because the load is isolated from t...

In this letter, we study the memristor-based oscillators, and propose for the first time the method of calculating its PPV (Perturbation Projection Vector). In order to get PPV, we have deduced the formula to convert PRC (Phase Response Curve) to PPV. The conversion method is verified rigorously by comparing PPV obtained from PSS+PXF simulation and PRC calculated from transient simulation of tw...

This paper offers a review of simulation methods currently available for the transient and steady-state analysis of nonlinear RF and microwave circuits. The most general method continues to be the time-marching approach used in Spice, but more recent methods based on multiple time dimensions are particularly effective for RF and microwave circuits. We derive nodal formulations for the most wide...

The verification of analog designs is a challenging and exhaustive task that requires deep understanding of physical behaviours. In this paper, we propose a qualitative based predicate abstraction method for the verification of a class of non-linear analog circuits. In the proposed method, system equations are automatically extracted from a circuit diagram by means of a bond graph. Verification...

This paper shows a new displacement-to-frequency transducer based on the variation of a coil inductance when a magnetic core is partially or completely inserted inside. This transducer is based on a Colpitts oscillator due its low manufacturing price, behavior and immunity to noise. A tank circuit with a configuration in parallel was used because it can be employed at lower frequencies and it e...

Demand for higher numbers of communication channels imposes tighter phase noise performance for the local oscillators. Cross-coupled oscillators are widely used due to ease of implementation and differential operation (Figure 17.2.1a) [1,2,3]. Unfortunately, in cross-coupled VCOs the maximum noise generation instant coincides with maximum phase noise sensitivity and hence the cross-coupled VCOs...

A low-power, 1.57-GHz RF front-end for a global positioning system (GPS) receiver has been designed in a 1.0m BiCMOS technology. It consists of a low noise amplifier with 15 dB of gain, a single balanced mixer with 6.3 mS of conversion gm, a Colpitts LC local oscillator, and an emitter coupled logic (ECL) divide-by-eight prescaler. This front-end has a singal sideband (SSB) noise figure of 8.1 ...