Patent ID: 7671640
Filing Date: 2010-03-02
Classification: H01F,H03B,H03J,H03K,H03L

Abstract:
1. A frequency divider circuit, comprising: an injection-locked oscillator circuit module, which has an input/output interface including a signal-input port for receiving an input signal, a control-voltage input port for receiving a tuning control voltage, and a pair of differential output ports including a positive differential output port and a negative differential output port for generating a differential pair of output signals; and whose internal architecture includes: a first buffer-stage circuit, which is constructed on a PMOS-based circuit architecture having a third inductive element, for providing a buffer effect to the output signal generated at the positive differential output port; and wherein the third inductive element of the first buffer-stage circuit is coupled to the first inductive element of the variable-capacitance tuning circuit to constitute a first inductive-coupling feedback architecture; and a second buffer-stage circuit, which is constructed on a PMOS-based circuit architecture having a fourth inductive element, for providing a buffer effect to the output signal generated at the negative differential output port; and wherein the fourth inductive element of the second buffer-stage circuit is coupled to the second inductive element of the variable-capacitance tuning circuit to constitute a second inductive-coupling feedback architecture.