Patent US5359298A successfully refreshed from Google Patents.
US5359298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
VCO having voltage-to-current converter and PLL using same
Assignee: Seiko Epson Corp
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Filing: 1993-12-29
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Granted: 1994-10-25
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Expires: 2013-12-29
Abstract
Abstract The voltage controlled oscillator in a phase-locked loop comprises a voltage-current converter (62) and a current frequency converter (34). The voltage-current converter (62) comprises a voltage differential-current converter (64), a current-current converter (66) and a current adder-subtracter (68). In the voltage differential-current converter (64), only the voltage fluctuation or difference ΔV CN with respect to one half a power supply voltage V DD /2, and not the absolute value of a control voltage V CN , undergoes current conversion as a control current I CN . Therefore, the center frequency of the oscillation frequency is not a factor of control voltage V CN and is controlled only by an offset voltage V B2 . Accordingly, the center frequency can be independently set by changing offset voltage VB 2 . This is particularly significant in zone bit recording, which requires a wide frequency band.
Inventors
- 👤 Akira Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:25
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/0805; H03K; H03K3/00; H03K3/02; H03K3/027; H03K3/03; H03K3/0315; H03K3/353; H03K3/354; H03L7/07; H03L7/099; H03L7/0995; H03L2207/00; H03L2207/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
A voltage-controlled oscillator having a voltage-current conversion apparatus that generates a converted current proportional to the level of an input voltage and a current frequency conversion apparatus that generates an oscillation frequency output corresponding to the level of the converted current, wherein the voltage-current conversion apparatus comprises: voltage differential-current conversion means comprising a voltage-current conversion switching means for selecting a conversion coefficient in response to a switching signal, said voltage differential-current conversion means for receiving the input voltage as a first input voltage and for converting it to a current in proportion to a difference between the input voltage and a reference voltage, the proportional coefficient of the converted current corresponding to the conversion coefficient; and current adder-subtracter means for generating a second current proportional to a second input voltage and for generating the converted current by adding or subtracting a first current based on the current generated by the voltage differential-current conversion means and the second current.
Claim 2
Dependent Claim
158 words
A voltage-controlled oscillator having a voltage-current conversion apparatus that generates a converted current proportional to the level of an input voltage and a current frequency conversion apparatus that generates an oscillation frequency output corresponding to the level of the converted current, wherein the voltage-current conversion apparatus comprises: voltage differential-current conversion means comprising a voltage-current conversion switching means for selecting a conversion coefficient in response to a switching signal, said voltage differential-current conversion means for receiving the input voltage as a first input voltage and for converting it to a current in proportion to a difference between the input voltage and a reference voltage, the proportional coefficient of the converted current corresponding to the conversion coefficient; and current adder-subtracter means for generating a second current proportional to a second input voltage and for generating the converted current by adding or subtracting a first current based on the current generated by the voltage differential-current conversion means and the second current.
Claim 3
Dependent Claim
32 words
The voltage-controlled oscillator of claim 1, wherein the voltage differential-current conversion means comprises current-current conversion means for generating the first current proportional to the current generated by the voltage differential-current conversion means.
Claim 4
Dependent Claim
189 words
A phase-locked loop circuit having a first phase-locked loop that synchronizes to a data pulse string and a second phase-locked loop that synchronizes to a reference clock; wherein voltage-controlled oscillators in the first and second phase-locked loops comprise: voltage-current conversion means for generating an output current proportional to the level of an input voltage; current frequency conversion means for generating an oscillation frequency output proportional to the level of the output current; and wherein the voltage-current conversion means comprises: voltage differential-current conversion means comprising a voltage-current conversion switching means for selecting a conversion coefficient in response to a switching signal, said voltage differential-current conversion means for receiving the input voltage as a first input voltage and converting it to a current proportional to a voltage difference between the input voltage and a reference voltage, the proportional coefficient of the converted current corresponding to the conversion coefficient; and current adder-subtracter means for providing a second current proportional to a second input voltage and for generating the output current by adding or subtracting a first current based on the current generated by the voltage differential-current conversion means and the second current.
Claim 5
Dependent Claim
189 words
A phase-locked loop circuit having a first phase-locked loop that synchronizes to a data pulse string and a second phase-locked loop that synchronizes to a reference clock; wherein voltage-controlled oscillators in the first and second phase-locked loops comprise: voltage-current conversion means for generating an output current proportional to the level of an input voltage; current frequency conversion means for generating an oscillation frequency output proportional to the level of the output current; and wherein the voltage-current conversion means comprises: voltage differential-current conversion means comprising a voltage-current conversion switching means for selecting a conversion coefficient in response to a switching signal, said voltage differential-current conversion means for receiving the input voltage as a first input voltage and converting it to a current proportional to a voltage difference between the input voltage and a reference voltage, the proportional coefficient of the converted current corresponding to the conversion coefficient; and current adder-subtracter means for providing a second current proportional to a second input voltage and for generating the output current by adding or subtracting a first current based on the current generated by the voltage differential-current conversion means and the second current.
Claim 6
Dependent Claim
35 words
The phase-locked loop circuit of claim 2, wherein the voltage differential-current conversion means comprises current-current conversion means for generating the first current, which is proportional to the current generated by the voltage differential-current conversion means.
References Cited (Backward Citations)
JPS5928209A
Cited
JPS60183818A
Cited
JPS62204615A
Cited
JPS6340371A
Cited
US4862015A
Cited
US5075639A
Cited
US5036216A
Cited
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