Abstract: A resonator-controlled oscillator arrangement comprises a resonator-controlled oscillator of which the operating frequency is adjustable and a control circuit for setting the operating frequency of the oscillator. The control circuit is operative to set the operating frequency in dependence upon prevailing ambient conditions. The control circuit has a control input for initiating a set-up procedure during which the operating frequency of the oscillator is set to a value remote from any resonance frequency of a coupled mode that would cause an activity dip.

Abstract: A circuit for use in a current source or a proportional to absolute temperature sensor or in a bandgap regulator, the circuit comprising at least two PTAT cells the operating Voltages of whose components overlap, the PTAT contribution to the output including the sum of the outputs of the two PTAT cells.