Abstract:
A system using temperature tracking for a controlled oscillator (CO) is provided. The system includes at least one coarse tuning capacitor circuit including a plurality of selectable coarse tuning capacitors operable in at least three modes of operation, thereby allowing switching between each coarse capacitor of the plurality of selectable coarse capacitors when a selected coarse tuning capacitor has reached one of its high tuning range and low tuning range.
Abstract:
Methods, apparatuses, and systems for providing a variable capacitance using an array of capacitor cells are discussed. In the fine tuning bank of an inductor/capacitor (LC)-tank of a digitally controlled oscillator (DCO), control is implemented by selecting a boundary cell from the array of capacitor cells and having every cell before the boundary cell in a circuit path be grounded and having the boundary cell and every cell after the boundary cell in the circuit path be connected to a voltage source. The circuit path may be the one formed by using thermometer coding in the fine tuning bank.