GB2228154A - On-chip integrated oscillator circuits - Google Patents

On-chip integrated oscillator circuits Download PDF

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Publication number
GB2228154A
GB2228154A GB8902870A GB8902870A GB2228154A GB 2228154 A GB2228154 A GB 2228154A GB 8902870 A GB8902870 A GB 8902870A GB 8902870 A GB8902870 A GB 8902870A GB 2228154 A GB2228154 A GB 2228154A
Authority
GB
United Kingdom
Prior art keywords
circuit
chip
resistor
oscillator
chip integrated
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB8902870A
Other versions
GB2228154B (en
GB8902870D0 (en
Inventor
Christopher J Beale
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB8902870A priority Critical patent/GB2228154B/en
Publication of GB8902870D0 publication Critical patent/GB8902870D0/en
Publication of GB2228154A publication Critical patent/GB2228154A/en
Application granted granted Critical
Publication of GB2228154B publication Critical patent/GB2228154B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H03B5/1231—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 bipolar 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
    • H03B5/1206—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
    • H03B5/1209—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 having two current paths operating in a differential manner and a current source or degeneration circuit in common to both paths, e.g. a 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
    • H03B5/1237—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
    • H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
    • H03B2200/0014—Structural aspects of oscillators
    • H03B2200/0026—Structural aspects of oscillators relating to the pins of integrated circuits
    • 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
    • H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
    • H03B2200/006—Functional aspects of oscillators
    • H03B2200/0098—Functional aspects of oscillators having a balanced output signal

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Semiconductor Integrated Circuits (AREA)

Abstract

An oscillator circuit is provided for I.C. implementation in which on-chip components of the circuit are connected to contact pads wherein at least one connection comprises a resistor. The resistor helps to diminish spurious high frequency oscillation modes. <IMAGE>

Description

ON CHIP INTEGRATED OSCILLATOR CIRCUITS This invention relates to the provision of oscillator circuits, for example as part of a larger integrated circuit.
It has been found that on-chip oscillators are subject to unwanted modes of oscillation due to capacitances of bond pads and inductances of metal tracks. In miniaturised circuits, such capacitances and inductances have a real effect in that the Q factors of the unwanted oscillations are relatively high. Resonances may be due to multiple tank circuits as well as to the I.C. package.
Figure 1 is a circuit diagram of a simple on-chip oscillator circuit showing also its external components. At point A, two high impedance points, shown as peaks in the graph (Figure 2) of frequency against impedance, correspond to oscillations at 110 MHz (wanted) and 900 MHz (unwanted). The second broader peak is due to the parasitic components as aforesaid within the circuit and, possibly, external circuit effects.
It is an object of the present invention to provide an improved oscillator circuit for implementation on-chip in an integrated circuit.
According to the present invention, there is provided an oscillator circuit, for implementation in an on-chip integrated circuit having on-chip connections to an external tank circuit, characterised in that one of said connections is formed as a resistor.
The on-chip oscillator may be any one of several well known oscillator circuits and the external components may similarly be of well known complementary form.
The on-chip components are brought out, in well known manner to contact pads (themselves a cause of parasitic capacitance) and from said pads are connected to package pins and to the external components. On chip metal tracks may be the cause of parasitic inductances.
The resistor may be included in the metal track or a resistor may be included in each of the metal tracks.
For a circuit tunable to an oscillator frequency of 110MHz, a 45 Q resistor in one of the tracks is advantageous in reducing the unwanted oscillations.
The invention will be described further, by way of example, with reference to Figure 3 of the accompanying drawings which shows the on-chip components of an oscillator in accordance with the present invention.
As shown in Figure 3, an oscillator circuits has a pair of transistors 10, 12 forming components of an integrated circuit. Also integrated on the chip is a resistor 14 in the collector lead of transistor 12 and a capacitor 16 coupling the base of this transistor to ground.
Metal tracks 18, 20 connect the components as described to bond pads 22, 24 enabling the circuit to be connected to pins of an I.C. whereon the chip is mounted, and to an external tank circuit such as the tunable external circuit shown in Figure 1.
In accordance with the present invention, a resistor 26 is included in the track 20.
If the open loop transfer characteristics of the circuit are examined at point A, it will be seen that the effect of the inclusion of the resistor 26 is to reduce the high impedance point at 900 MHz as shown by the dashed line in Figure 2, without having any noticeable effect on the circuit response at the required 110 MHz.
Depending on the design frequency of the circuit a resistor may be included also in the track 18.
The invention is applicable to most on-chip oscillators with complementary external fixed or tunable compenents.

Claims (3)

CLAIMS:-
1. An oscillator circuit, for implementation in an on-chip integrated circuit, having on-chip connections to an external task circuit characterised in that one of said connections comprises a resistor.
2. A circuit as claimed in Claim 1 wherein the connections are in the form of metal tracks connecting components of the circuit to onchip contact pads and wherein at least one of said metal tracks comprises a resistor.
3. An oscillator circuit substantially as hereinbefore described with reference to Figure 3 of the accompanying drawing.
GB8902870A 1989-02-09 1989-02-09 On-chip integrated oscillator circuits Expired - Lifetime GB2228154B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8902870A GB2228154B (en) 1989-02-09 1989-02-09 On-chip integrated oscillator circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8902870A GB2228154B (en) 1989-02-09 1989-02-09 On-chip integrated oscillator circuits

Publications (3)

Publication Number Publication Date
GB8902870D0 GB8902870D0 (en) 1989-03-30
GB2228154A true GB2228154A (en) 1990-08-15
GB2228154B GB2228154B (en) 1993-04-21

Family

ID=10651371

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8902870A Expired - Lifetime GB2228154B (en) 1989-02-09 1989-02-09 On-chip integrated oscillator circuits

Country Status (1)

Country Link
GB (1) GB2228154B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726648A1 (en) * 1995-02-08 1996-08-14 Philips Composants Et Semiconducteurs Tuning circuit for a receiver apparatus particularly a television receiver
EP0863605A2 (en) * 1997-03-07 1998-09-09 Deutsche Thomson-Brandt Gmbh Circuit arrangement for avoiding parasitic oscillation modes within an oscillator circuit
WO1999017438A1 (en) * 1997-09-30 1999-04-08 Koninklijke Philips Electronics N.V. Oscillator
EP0948127A1 (en) * 1998-03-31 1999-10-06 Lucent Technologies Inc. Improvements in or relating to integrated circuits for voltage controlled oscillators

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2015289A (en) * 1978-01-20 1979-09-05 Anvar A multifunction electronic circuit arrangement having four basic circuits and applications of said circuit arrangement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2015289A (en) * 1978-01-20 1979-09-05 Anvar A multifunction electronic circuit arrangement having four basic circuits and applications of said circuit arrangement

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Analog Inte *
fig.11.14 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726648A1 (en) * 1995-02-08 1996-08-14 Philips Composants Et Semiconducteurs Tuning circuit for a receiver apparatus particularly a television receiver
EP0863605A2 (en) * 1997-03-07 1998-09-09 Deutsche Thomson-Brandt Gmbh Circuit arrangement for avoiding parasitic oscillation modes within an oscillator circuit
EP0863605A3 (en) * 1997-03-07 1999-02-03 Deutsche Thomson-Brandt Gmbh Circuit arrangement for avoiding parasitic oscillation modes within an oscillator circuit
US6215367B1 (en) 1997-03-07 2001-04-10 Deutsche Thomson-Brandt Gmbh Circuit for avoiding parasitic oscillation modes in an oscillator resonant circuit
WO1999017438A1 (en) * 1997-09-30 1999-04-08 Koninklijke Philips Electronics N.V. Oscillator
US6097258A (en) * 1997-09-30 2000-08-01 U.S. Philips Corporation Oscillator having a resonator coupled to an amplifier by a series resistance
EP0948127A1 (en) * 1998-03-31 1999-10-06 Lucent Technologies Inc. Improvements in or relating to integrated circuits for voltage controlled oscillators
US6140884A (en) * 1998-03-31 2000-10-31 Lucent Technologies Inc. Integrated circuits for voltage controlled oscillators

Also Published As

Publication number Publication date
GB2228154B (en) 1993-04-21
GB8902870D0 (en) 1989-03-30

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Expiry date: 20090208