Wide-band voltage controlled oscillator
First Claim
1. A wide-band voltage controlled oscillator comprising:
- a cross-connected oscillator configured to provide an oscillating signal;
an inductor unit configured to provide inductance for determining a resonance frequency of the oscillating signal;
a varactor bank comprising a plurality of switchable variable-capacitance elements which are connected to the inductor unit in parallel and have predetermined varactor capacitances, wherein one of the plurality of switchable variable-capacitance elements is selected by a first switching signal so that the varactor bank has a variable capacitance varying with a tuning voltage;
a subsection capacitor bank comprising a plurality of switchable capacitor elements connected to the inductor unit in parallel, having predetermined capacitances for fractionized frequency sections, and selectively switched on by a second switching signal so that the subsection capacitor bank has a variable capacitance for the fractionized frequency sections; and
a binary-weighted capacitor bank comprising a plurality of binary-weighted capacitor banks connected to the inductor unit in parallel and a bank selector configured to select one of the plurality of binary-weighted capacitor banks according to a bank selection signal, wherein each of the binary-weighted capacitor banks comprises a plurality of switchable capacitor elements which are connected in parallel to one another and selectively switched on by a third switching signal so that the binary-weighted capacitor bank has a variable binary-weighted capacitance,wherein the ratio of the variable capacitance of the varactor bank to the total capacitance of the subsection capacitor bank and the binary-weighted capacitor bank is kept constant for a plurality of predetermined frequency sections comprising a first frequency section, a second frequency section, a third frequency section and a fourth frequency section,wherein the total capacitance of the subsection bank and the binary-weighted capacitor bank is further set to vary in a nearly exponential way according to a digital control signal.
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Accused Products
Abstract
A wide-band voltage controlled oscillator includes a cross-connected transistors for providing a stable oscillating signal, an inductor unit for providing an inductance for determining a resonance frequency, a varactor bank including a plurality of switchable variable-capacitance elements parallely connected to the inductor unit and having a varactor capacitance varying with the first switching signal and a tuning voltage, a subsection capacitor bank including a plurality of switchable capacitor elements parallely connected to the inductor unit and having predetermined capacitances for grouping frequency sections, and a binary-weighted capacitor bank including a plurality of binary-weighted capacitor arrays parallely connected to the inductor unit and a bank selector for selecting one of the binary-weighted capacitor arrays, wherein each binary-weighted capacitor arrays includes a plurality of parallely connected switchable capacitor elements selectively switched on by a third switching signal to determine a variable weighted capacitance of the tunable binary-weighted capacitor bank.
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Citations
17 Claims
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1. A wide-band voltage controlled oscillator comprising:
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a cross-connected oscillator configured to provide an oscillating signal; an inductor unit configured to provide inductance for determining a resonance frequency of the oscillating signal; a varactor bank comprising a plurality of switchable variable-capacitance elements which are connected to the inductor unit in parallel and have predetermined varactor capacitances, wherein one of the plurality of switchable variable-capacitance elements is selected by a first switching signal so that the varactor bank has a variable capacitance varying with a tuning voltage; a subsection capacitor bank comprising a plurality of switchable capacitor elements connected to the inductor unit in parallel, having predetermined capacitances for fractionized frequency sections, and selectively switched on by a second switching signal so that the subsection capacitor bank has a variable capacitance for the fractionized frequency sections; and a binary-weighted capacitor bank comprising a plurality of binary-weighted capacitor banks connected to the inductor unit in parallel and a bank selector configured to select one of the plurality of binary-weighted capacitor banks according to a bank selection signal, wherein each of the binary-weighted capacitor banks comprises a plurality of switchable capacitor elements which are connected in parallel to one another and selectively switched on by a third switching signal so that the binary-weighted capacitor bank has a variable binary-weighted capacitance, wherein the ratio of the variable capacitance of the varactor bank to the total capacitance of the subsection capacitor bank and the binary-weighted capacitor bank is kept constant for a plurality of predetermined frequency sections comprising a first frequency section, a second frequency section, a third frequency section and a fourth frequency section, wherein the total capacitance of the subsection bank and the binary-weighted capacitor bank is further set to vary in a nearly exponential way according to a digital control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification