Configurable adaptive ultra low noise wideband VCOs

The current diversity of available wireless services comes up with the necessity of multi-mode, multi-band, and multi-standard trans-receivers operating in several frequency bands, therefore, requiring a wideband source that may replace several narrow band voltage controlled oscillator (VCO) modules by a single low noise wideband VCO. The coupled resonators/oscillators design approach demonstrated in this work can satisfy the need for the present demand for low cost, low noise, power efficient, wide tuning range, compact size, and amenable for integration in chip form. The measured phase noise is better than -115 dBc/Hz at 100 kHz offset over the tuning range (1-4 GHz/4-8 GHz), and to our knowledge, this is the highest tuning band of operation using N-push topology with discrete components so far reported.