Current-mode gain-splitting dual-path VCO
First Claim
1. An integrated circuit comprising:
- a voltage-to-current converter configured to receive a control voltage and generate a first current and a second current;
a current amplifier configured to amplify and filter the first current and generate a third current;
a summer configured to sum the second current and the third current to generate a control current; and
a current-controlled oscillator (ICO) configured to receive the control current and generate an oscillator signal having a frequency determined by the control current.
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Accused Products
Abstract
Techniques to effectively handle large voltage-controlled oscillator (VCO) gain are described. The techniques utilize (1) a slow high-gain path to provide an average control current that adjusts the center frequency of a VCO and (2) a fast low-gain path to provide an instantaneous control current that adjusts the VCO frequency during normal operation. In one design, the VCO includes a voltage-to-current converter, a current amplifier, a summer, and a current-controlled oscillator (ICO). The voltage-to-current converter receives a control voltage and generates a first current and a second current. The current amplifier amplifies and filters the first current and generates a third current. The summer sums the second current and the third current and generates a control current. The ICO receives the control current and generates an oscillator signal having a frequency determined by the control current.
31 Citations
20 Claims
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1. An integrated circuit comprising:
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a voltage-to-current converter configured to receive a control voltage and generate a first current and a second current;
a current amplifier configured to amplify and filter the first current and generate a third current;
a summer configured to sum the second current and the third current to generate a control current; and
a current-controlled oscillator (ICO) configured to receive the control current and generate an oscillator signal having a frequency determined by the control current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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generating a first current and a second current based on a control voltage;
amplifying and filtering the first current to generate a third current;
summing the second current and the third current to generate a control current; and
generating an oscillator signal having a frequency determined by the control current. - View Dependent Claims (10)
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11. An apparatus comprising:
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means for generating a first current and a second current based on a control voltage;
means for amplifying and filtering the first current to generate a third current;
means for summing the second current and the third current to generate a control current; and
means for generating an oscillator signal having a frequency determined by the control current. - View Dependent Claims (12)
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13. An integrated circuit comprising:
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a converter configured to receive a control voltage, to generate a first current via a slow high-gain path, to generate a second current via a fast low-gain path, and to sum the first current and the second current to generate a control current; and
a current-controlled oscillator (ICO) configured to receive the control current and generate an oscillator signal having a frequency determined by the control current. - View Dependent Claims (14, 15)
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16. A wireless device comprising:
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a converter configured to receive a control voltage, to generate a first current via a slow high-gain path, to generate a second current via a fast low-gain path, and to sum the first current and the second current to generate a control current; and
a current-controlled oscillator (ICO) configured to receive the control current and generate an oscillator signal having a frequency determined by the control current. - View Dependent Claims (17, 18, 19, 20)
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Specification