WO2002027937A1 - Oscillateur a tension variable - Google Patents

Oscillateur a tension variable Download PDF

Info

Publication number
WO2002027937A1
WO2002027937A1 PCT/SE2001/002113 SE0102113W WO0227937A1 WO 2002027937 A1 WO2002027937 A1 WO 2002027937A1 SE 0102113 W SE0102113 W SE 0102113W WO 0227937 A1 WO0227937 A1 WO 0227937A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
capacitance
variable capacitance
controlled oscillator
voltage controlled
Prior art date
Application number
PCT/SE2001/002113
Other languages
English (en)
Inventor
Fredrik Jonsson
Original Assignee
Spirea Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Spirea Ab filed Critical Spirea Ab
Priority to AU2001292489A priority Critical patent/AU2001292489A1/en
Publication of WO2002027937A1 publication Critical patent/WO2002027937A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1206—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification
    • H03B5/1212—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1206—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification
    • H03B5/1212—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair
    • H03B5/1215—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair the current source or degeneration circuit being in common to both transistors of the pair, e.g. a cross-coupled long-tailed pair
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1206—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification
    • H03B5/1221—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device using multiple transistors for amplification the amplifier comprising multiple amplification stages connected in cascade
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1228—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more field effect transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
    • H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
    • H03B5/1243—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising voltage variable capacitance diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
    • H03B2201/02—Varying the frequency of the oscillations by electronic means
    • H03B2201/0208—Varying the frequency of the oscillations by electronic means the means being an element with a variable capacitance, e.g. capacitance diode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B27/00—Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L2207/00—Indexing scheme relating to automatic control of frequency or phase and to synchronisation
    • H03L2207/06—Phase locked loops with a controlled oscillator having at least two frequency control terminals

Definitions

  • This invention relates generally to a voltage controlled oscillator, and more particularly it relates to a variable capacitor tuned voltage controlled oscillator (VCO) adapted for use in wireless communication system.
  • VCO variable capacitor tuned voltage controlled oscillator
  • a common way of obtaining the frequency tuning of a VCO is to provide it with a resonator circuit comprising a variable capacitor circuit.
  • the potential of an input connected to said variable capacitor circuit is varied in order to control the output frequency.
  • a problem of this type of circuit is that it becomes sensitive to internal leakage, which may affect the potential of the capacitor circuit, and thus the output frequency of the VCO.
  • prior art circuitry in general is not integrated, which is a drawback in modern wireless applications. It is, however, not an easy task to integrate discrete or hybrid solutions.
  • the Local Oscillator can be used both to set the correct frequency channel and to modulate the carrier.
  • a VCO having two inputs is used, where one input receives a DC control voltage and the other receives a modulation signal.
  • the output signal of the oscillator could be regarded as a modulated carrier.
  • the carrier frequency is determined by means of a phased locked loop (PLL) .
  • PLL phased locked loop
  • One input of the PLL is connected to a frequency divider, which in turn receives the output of the VCO.
  • the other input of the PLL is connected to a reference frequency generator.
  • the output signal of the PLL is input to a low pass filter for generating the very control voltage, which is supplied to the VCO .
  • circuitry is arranged so as to generate an output signal the frequency of which is dependent on both the control voltage and the modulation signal.
  • An object of this invention is to provide a voltage controlled oscillator implemented as an integrated circuit having good properties.
  • an integrated circuit voltage controlled oscillator comprising a resonator circuit; an amplifier circuit connected to said resonator circuit; a first input terminal; and an output terminal; said amplifier and resonator circuits being arranged as a differential circuit having a first and a second branch; said resonator circuit comprising a variable capacitance circuit and an inductance circuit connected to and interacting with said variable capacitance circuit; said input terminal being provided at a first balanced input node of said variable capacitance circuit between said first and second branches, the capacitance of at least a part of said variable capacitance circuit, and the frequency of an output signal at said output terminal, being related to a potential at said input terminal; and said capa- citance circuit comprising a first pair of variable capacitance units being DC isolated and being connected to said balanced input node and to said first and second branches respectively.
  • the balanced input node to which the input terminal as well as the pair of capacitance units are connected, in combination with the DC isolation of the capacitance units, eliminates or at least substantially reduces the prior art problem of leakage of the oscillation signal to the input, and, consequently, the need for a filter is considerably reduced. Furthermore, the differential coupling is advantageous as to the eliminated need for decoupling capacitors.
  • the variable capacitance circuit comprises a second input terminal, which is provided at a second balanced input node of said variable capacitance circuit, wherein said capacitance circuit comprises a second pair of variable capacitance units, which are connected to a respective one of said first and second branches and which are connected to said second balanced input node, the capacitance of said second pair being related to a potential at said second input terminal; and wherein the variable capacitance units of one of said pairs are high sensitive and the variable capacitance units of the other one of said pairs are low sensitive.
  • the VCO according to this embodiment by using separate capacitance units for the first and second input terminals respectively, substantially reduces the above- mentioned problem of the modulation index being related to the channel frequency.
  • the different sensitivity is useable for different applications, where both coarse and fine tuning are desired.
  • DC isolated components are used for the variable capacitance units, and preferably MIS varactors are employed. This is advantageous due to the substantial elimination of current leakage through the capacitance units . Further objects and advantages of the present invention will be discussed below by means of exemplifying embodiments .
  • Fig. 1 shows an application of the voltage controlled oscillator according to the present invention, where it is an element of a phase locked loop (PLL) ;
  • PLL phase locked loop
  • Fig. 2 is a circuit diagram of a first embodiment of the voltage controlled oscillator according to the present invention
  • Fig. 3 is a circuit diagram of a second embodiment of the voltage controlled oscillator according to the present invention
  • Fig. 4 is a circuit diagram of a third embodiment of the voltage controlled oscillator according to the present invention.
  • Fig. 5 is a cut out of the circuit of Fig. 2, though showing a different embodiment of the capacitance circuit
  • Fig. 6 shows a capacitance unit of Fig. 5 in greater detail.
  • a typical use of a VCO is in a PLL.
  • An example thereof is shown in Fig. 1.
  • the output of the VCO is connected to the input of a programmable divider 3.
  • the output of the programmable divider is connected to a first input of a Phase/Frequency detector and Charge Pump (PFD+CP) element 5.
  • a second input to the PFD+CP element receives a reference frequency.
  • the output of the PFD+CP element 5 is connected to the input of a loop filter 7.
  • the output of the loop filter 7 is connected to a second input V cont 2 of the VCO 1, thereby providing the VCO 1 with a control voltage signal setting the carrier frequency of the output signal of the VCO 1.
  • a first input of the VCO 1 receives a modulating voltage signal.
  • the output of the PLL that is the output of the VCO 1, is connected to a power amplifier, a mixer, or the like of the radio communication device in which the PLL is mounted.
  • the VCO 1 comprises a resonator circuit 11 and an amplifier circuit 13, which is connected to said resonator circuit 11.
  • the resonator circuit ll is arranged as a differential structure, i.e. it operates in a differential circuit, and comprises a capacitance circuit and an inductance circuit connected to and interacting with said capacitance circuit.
  • the capacitance circuit in this embodiment comprises four capacitance units, or elements, 15, 17, 19, and 21, arranged in pairs coupled in series.
  • the inductance circuit in this embodiment comprises a single inductor 23.
  • the differential structure has two branches, or sides, 25 and 27 respectively, which will below be referred to as the first 25 and second 27 branch.
  • Each branch 25, 27 comprises a main node 29 and 31 respectively, which will be referred to as the first 29 and second 31 nodes.
  • the first pair of capacitance units i.e. a first capacitance unit 15 coupled in series with a second capacitance unit 17, is connected between the first node 29 and the second node 31, as is the second pair comprising a third capacitance unit 19 coupled in series with a fourth capacitance unit 21.
  • the inductor 23 is connected between the nodes 29 and 31.
  • a first input terminal V cont ⁇ is provided at a first balanced input between the capacitance units 15, 17 of the first pair, and a second input terminal V CO nt2 is provided at a second balanced input between the capacitance units 19, 21 of the second pair.
  • An output terminal Out is provided at the first node 29 and an inverted output terminal Out is provided at the second node 31.
  • the amplifier circuit 13 comprises a first pair of transistors 33, 35, a second pair of transistors 37, 39, and a single fifth transistor 41. Said first pair of transistors is connected between said first and second nodes 29, 31 and ground G.
  • the transistors 33 and 35 of said first pair of transistors are cross connected in a gate-drain connection. Preferably they are NMOS type transistors.
  • the transistors 37, 39 of said second pair of transistors are cross connected in a gate-source connection, and each one of their sources is connected to a respective one of said first and second nodes 29, 31,
  • the transistors 37, 39 preferably are PMOS type transistors, and their drains are interconnected and connected to the source of said single transistor 41.
  • the drain of the single transistor 41 is connected to a supply voltage d and the gate thereof is connected to a bias voltage Vbias.
  • the single transistor 41 is a PMOS type transistor.
  • the VCO 1 operates as follows.
  • the frequency con- tents of the output signal is dependent on the input signals of both inputs V C ⁇ nt ⁇ and V Co nt2.
  • the input signal of the first input V C ⁇ nt ⁇ which below will be referred to as the first input signal, controls the carrier frequency of the output signal.
  • the input signal of the second input V C0 nt2. i.e. the second input signal modulates the carrier frequency. In other words the second input signal generates a modulating signal, which is superimposed on the carrier signal.
  • a typical carrier frequency is in the order of Gigahertz, and the tuning range thereof is in the order of hundreds of Megahertz.
  • the frequency of the modulating signal is ⁇ ⁇ to to ⁇ 1 c ⁇ o C ⁇ o c ⁇ o C ⁇
  • capacitance units 51, 53 which are DC isolated components, preferably MIS varactors. In other embodiments with more input terminals and/or more capacitance units some of them can be chosen as non DC isolated components, such as capacitance diodes. However, in accordance with the invention at least one input should be DC isolated.
  • the MIS varactors 51, 53 are connected between the input terminal and nodes of the first branch 57 and the second branch 59 respectively, and thus are interconnected as well at the input terminal. Due to the electric isolation of the gate of the MIS varactor, i.e. of the input terminal, as is evident from Fig. 6, the properties of the VCO dependent on low internal current leakage are enhanced.
  • variable capacitance unit Of course also other MOS components, such as NMOS transistors, PMOS transistors or devices where metal is used to form an isolated gate are suitable for the use as variable capacitance unit.
  • the MIS varactor is particularly suitable in a standard CMOS process due to its low serial resistance and highly voltage dependent capacitance.
  • This single input VCO is useful in many applications, such as applications where other modulation schemes than Frequency Modulation, such as WLAN and WCDMA are used.

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

L'invention concerne un oscillateur à tension variable à circuit intégré comprenant un circuit résonateur; un circuit amplificateur connecté à ce circuit résonateur; un premier terminal d'entrée; et un terminal de sortie. Les circuits amplificateur et résonateur sont conçus sous la forme d'un circuit différentiel ayant une première et une deuxième branche. Le circuit résonateur comprend un circuit de capacité variable et un circuit d'inductance qui est connecté au circuit de capacité variable et coopère avec ce dernier. Le terminal d'entrée est pourvu au niveau d'un premier noeud d'entrée symétrique du circuit de capacité variable entre la première et la deuxième branche. La capacité d'au moins une partie de ce circuit de capacité variable et la fréquence d'un signal de sortie au niveau de ce terminal d'entrée sont liées au potentiel appliqué à ce terminal d'entrée. Le circuit de capacité comprend une première paire d'unités de capacité variable isolées c.c et connectées au noeud d'entrée symétrique et respectivement à la première et à la deuxième branche.
PCT/SE2001/002113 2000-09-29 2001-09-28 Oscillateur a tension variable WO2002027937A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001292489A AU2001292489A1 (en) 2000-09-29 2001-09-28 Voltage controlled oscillator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0003510A SE0003510D0 (sv) 2000-09-29 2000-09-29 Voltage controlled oscillator
SE0003510-5 2000-09-29

Publications (1)

Publication Number Publication Date
WO2002027937A1 true WO2002027937A1 (fr) 2002-04-04

Family

ID=20281232

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2001/002113 WO2002027937A1 (fr) 2000-09-29 2001-09-28 Oscillateur a tension variable

Country Status (3)

Country Link
AU (1) AU2001292489A1 (fr)
SE (1) SE0003510D0 (fr)
WO (1) WO2002027937A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004010571A1 (fr) * 2002-07-18 2004-01-29 Qualcomm, Incorporated Procede et appareil de circuit resonant de vco a bande large
WO2004042913A1 (fr) * 2002-10-30 2004-05-21 Qualcomm Incorporated Oscillateur commande en tension et a polarisation automatique
WO2005086342A1 (fr) * 2004-02-27 2005-09-15 Qualcomm Incorporated Oscillateur controle par tension comprenant un varactor interpolatif a sensibilite de modulation constante
DE102004020975A1 (de) * 2004-04-22 2005-11-17 Atmel Germany Gmbh Oszillator und Verfahren zum Betreiben eines Oszillators
WO2005122397A2 (fr) * 2004-06-08 2005-12-22 Koninklijke Philips Electronics N.V. Agencement reglable en sequence
FR2905808A1 (fr) * 2006-09-12 2008-03-14 United Monolithic Semiconduct Oscillateur hyperfrequence en technologie des circuits integres
WO2008121521A1 (fr) * 2007-03-30 2008-10-09 Motorola, Inc. Circuit d'oscillateur contrôlé en tension
WO2009043930A1 (fr) * 2007-10-05 2009-04-09 The Swatch Group Research And Development Ltd Procédé d'auto-calibrage d'un synthétiseur de fréquence à modulation fsk à deux points

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5371475A (en) * 1993-06-03 1994-12-06 Northern Telecom Limited Low noise oscillators and tracking filters
US5694092A (en) * 1995-07-13 1997-12-02 Nec Corporation Voltage-controlled oscillator including first and second varactors having differing rates of change in capacitance value
EP1030439A1 (fr) * 1999-02-17 2000-08-23 Murata Manufacturing Co., Ltd. Oscillateur et oscillateur commandé en tension

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5371475A (en) * 1993-06-03 1994-12-06 Northern Telecom Limited Low noise oscillators and tracking filters
US5694092A (en) * 1995-07-13 1997-12-02 Nec Corporation Voltage-controlled oscillator including first and second varactors having differing rates of change in capacitance value
EP1030439A1 (fr) * 1999-02-17 2000-08-23 Murata Manufacturing Co., Ltd. Oscillateur et oscillateur commandé en tension

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004010571A1 (fr) * 2002-07-18 2004-01-29 Qualcomm, Incorporated Procede et appareil de circuit resonant de vco a bande large
WO2004042913A1 (fr) * 2002-10-30 2004-05-21 Qualcomm Incorporated Oscillateur commande en tension et a polarisation automatique
WO2005086342A1 (fr) * 2004-02-27 2005-09-15 Qualcomm Incorporated Oscillateur controle par tension comprenant un varactor interpolatif a sensibilite de modulation constante
US7471164B2 (en) 2004-04-22 2008-12-30 Atmel Germany Gmbh Oscillator and method for operating an oscillator
DE102004020975A1 (de) * 2004-04-22 2005-11-17 Atmel Germany Gmbh Oszillator und Verfahren zum Betreiben eines Oszillators
WO2005122397A2 (fr) * 2004-06-08 2005-12-22 Koninklijke Philips Electronics N.V. Agencement reglable en sequence
WO2005122397A3 (fr) * 2004-06-08 2006-03-16 Koninkl Philips Electronics Nv Agencement reglable en sequence
US7885623B2 (en) 2004-06-08 2011-02-08 Nxp B.V. Frequency tunable arrangement
FR2905808A1 (fr) * 2006-09-12 2008-03-14 United Monolithic Semiconduct Oscillateur hyperfrequence en technologie des circuits integres
WO2008031717A3 (fr) * 2006-09-12 2008-09-12 United Monolithic Semiconduct Oscillateur hyperfréquence en technologie des circuits intégrés
WO2008031717A2 (fr) * 2006-09-12 2008-03-20 United Monolithic Semiconductors S.A. Oscillateur hyperfréquence en technologie des circuits intégrés
US8098108B2 (en) 2006-09-12 2012-01-17 Thales Microwave oscillator using integrated circuit technology
WO2008121521A1 (fr) * 2007-03-30 2008-10-09 Motorola, Inc. Circuit d'oscillateur contrôlé en tension
WO2009043930A1 (fr) * 2007-10-05 2009-04-09 The Swatch Group Research And Development Ltd Procédé d'auto-calibrage d'un synthétiseur de fréquence à modulation fsk à deux points

Also Published As

Publication number Publication date
SE0003510D0 (sv) 2000-09-29
AU2001292489A1 (en) 2002-04-08

Similar Documents

Publication Publication Date Title
US7522007B2 (en) Injection locked frequency divider
USRE41207E1 (en) Fully integrated ALL- CMOS AM transmitter with automatic antenna tuning
US7239209B2 (en) Serially RC coupled quadrature oscillator
USRE40620E1 (en) Fully integrated All-CMOS AM transmitter with automatic antenna tuning
US6281758B1 (en) Differential LC-VCO, charge pump, and loop filter architecture for improved noise-immunity in integrated phase-locked loops
US6657509B1 (en) Differentially controlled varactor
US7256660B2 (en) CMOS LC-tank oscillator
US6150893A (en) Voltage controlled oscillator with wide frequency range and low noise for integrated circuit fabrication
WO2002027937A1 (fr) Oscillateur a tension variable
EP0945986A2 (fr) Circuit pompe de charge pour boucle à verrouillage de phase
US20040012450A1 (en) Broadband voltage controlled oscillator supporting improved phase noise
US7126435B2 (en) Voltage controlled oscillator amplitude control circuit
US6864728B1 (en) Frequency multiplier and amplification circuit
US6060956A (en) Variable capacitance circuit
US6842081B2 (en) Dual frequency voltage controlled oscillator circuit
US6724273B1 (en) Filter circuitry for voltage controlled oscillator
US9106179B2 (en) Voltage-controlled oscillators and related systems
US7519342B2 (en) Tunable tracking filter
US20060226923A1 (en) Oscillator circuit
US6002303A (en) Oscillator circuit having a differential configuration and method of forming same
US20090189706A1 (en) Inductance-switchable dual-band voltage controlled oscillation circuit
US6788160B2 (en) Oscillator circuit connected to a voltage source providing a substantially constant supply voltage
US20120007686A1 (en) Multiband voltage controlled oscillator without switched capacitor
GB2330711A (en) Controllable IC capacitance for a VCO
EP1175731B1 (fr) Emetteur am tout cmos completement integre a reglage d'antenne automatique

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ CZ DE DE DK DK DM DZ EC EE EE ES FI FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PH PL PT RO RU SD SE SG SI SK SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP