Abstract:
An LC oscillator is provided that achieves improved phase noise performance. A variable frequency oscillator includes a variable supply source (I), an oscillator tank circuit (T), a variable capacitance circuit (VC1) comprising MOS switches, and an oscillator tank voltage common mode adjustment circuit (R). When the capacitance of the variable capacitance circuit is varied to vary an output frequency of the variable frequency oscillator, the common mode voltage is adjusted to reduce transitions of the MOS switches between an inversion state and a depletion state during excursions of an output signal through one cycle of oscillation.
Abstract:
A reference oscillator arrangement is provided for a communication apparatus capable of communicating according to a plurality of transport formats. The reference oscillator arrangement comprises a reference oscillator controller; a resonator core comprising a reference resonator and a driving circuit for the reference resonator, wherein the resonator core is arranged to provide an oscillating signal at a frequency of the reference resonator; and a reference oscillator buffer arrangement, connected to the resonator core, comprising an active circuit arranged to provide a reference oscillator output based on the oscillating signal. The reference oscillator controller is arranged to receive information about an applied transport format and control the driving circuit and/or the active circuit based on the information about the applied transport format. An oscillator arrangement, a communication device, methods therefor and a computer program are also disclosed.
Abstract:
An LC oscillator is provided that achieves improved phase noise performance. A variable frequency oscillator includes a variable supply source (I), an oscillator tank circuit (T), a variable capacitance circuit (VC1) comprising MOS switches, and an oscillator tank voltage common mode adjustment circuit (R). When the capacitance of the variable capacitance circuit is varied to vary an output frequency of the variable frequency oscillator, the common mode voltage is adjusted to reduce transitions of the MOS switches between an inversion state and a depletion state during excursions of an output signal through one cycle of oscillation.
Abstract:
Technologies are generally described for quadrature -based injection- locking of ring oscillators. In some examples, an external signal may be injected into a ring oscillator. Phase signals may be measured from within the ring oscillator and used to determine a mean quadrature error (MQE) that characterizes the difference in frequency between the external signal and the ring oscillator's natural frequency. A control signal may then be generated from the MQE and used to adjust the ring oscillator natural frequency to reduce the difference between the ring oscillator natural frequency and the external signal.
Abstract:
Voltage-controlled oscillation (100) is described. In an apparatus therefor, an inductor (120) has a tap and has or is coupled to a positive-side output node (105) and a negative side output node (106). The tap is coupled to receive a first current. A coarse grain capacitor array (130) is coupled to the positive-side output node (105) and the negative side output node (106) and is coupled to respectively receive select signals (168). A varactor (140) is coupled to the positive-side output node (105) and the negative side output node (106) and is coupled to receive a control voltage (143). The varactor (140) includes MuGFETs (141, 142). A transconductance cell (150) is coupled to the positive- side output node (105) and the negative side output node (106), and the transconductance cell (150) has a common node (107). A frequency scaled resistor network (160) is coupled to the common node (107) and is coupled to receive the select signals (168) for a resistance for a path for a second current.
Abstract:
Technologies are generally described for quadrature-based injection-locking of ring oscillators. In some examples, an external signal may be injected into a ring oscillator. Phase signals may be measured from within the ring oscillator and used to determine a mean quadrature error (MQE) that characterizes the difference in frequency between the external signal and the ring oscillator's natural frequency. A control signal may then be generated from the MQE and used to adjust the ring oscillator natural frequency to reduce the difference between the ring oscillator natural frequency and the external signal.
Abstract:
Technologies are generally described for quadrature-based injection-locking of ring oscillators. In some examples, an external signal may be injected into a ring oscillator. Phase signals may be measured from within the ring oscillator and used to determine a mean quadrature error (MQE) that characterizes the difference in frequency between the external signal and the ring oscillator's natural frequency. A control signal may then be generated from the MQE and used to adjust the ring oscillator natural frequency to reduce the difference between the ring oscillator natural frequency and the external signal.
Abstract:
Verfahren zum Regeln der Amplitude des Ausgangssignales eines Oszillators, der mindestens einen Oszillatortransistor (T1, T2) aufweist, dessen Emitteranschluß über eine steuerbare Stromquelle (IE) an ein Versorgungspotential geschaltet ist und der - der Oszillator - ein frequenzbestimmendes Element (L,C) beispielsweise einen Schwingkreis - aufweist, das mindestens an den Basisanschluß oder an den Kollektoranschluß mindestens eines der Oszillatortransistoren angeschlossen ist, wobei die aus einer Amplitudenänderung des an dem Basisanschluß mindestens eines der Oszillatortransistoren anliegenden Signales resultierende Gleichspannungsänderung am Emitteranschluß (a) mindestens dieses einen Oszillatortransistors als Steuergröße für den Strom der steuerbaren Stromquelle vorgesehen ist sowie eine Schaltungsanordnung zur Durchführung eines solchen Verfahrens.
Abstract:
Technologies are generally described for quadrature-based injection-locking of ring oscillators. In some examples, an external signal may be injected into a ring oscillator. Phase signals may be measured from within the ring oscillator and used to determine a mean quadrature error (MQE) that characterizes the difference in frequency between the external signal and the ring oscillator's natural frequency. A control signal may then be generated from the MQE and used to adjust the ring oscillator natural frequency to reduce the difference between the ring oscillator natural frequency and the external signal.