Partitioning of radio-frequency apparatus
First Claim
1. A radio-frequency (RF) apparatus comprising:
- one or more integrated circuits comprising integrated RF circuitry, said integrated RF circuitry including integrated digital-to-analog conversion (DAC) circuitry; and
external frequency modification circuitry coupled to said integrated RF circuitry and comprising at least one variable capacitance device, said external frequency modification circuit being configured for coupling to a crystal to form a crystal oscillator circuit that is capable of generating an adjustable reference signal and of providing said adjustable reference signal to said integrated RF circuitry, said at least one variable capacitance device configured to adjust the frequency of said adjustable reference signal based at least in part on one or more analog frequency control signals received by said external frequency modification circuitry;
wherein said integrated RF circuitry is configured for coupling to baseband processor circuitry, and wherein said integrated DAC circuitry is configured to receive one or more digital frequency control signals from said baseband processor circuitry and to generate and provide at least a portion of said one or more analog frequency control signals to said external frequency modification circuit based on said one or more digital frequency control signals.
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Accused Products
Abstract
Components of a radio-frequency (RF) apparatus including transceiver circuitry and frequency modification circuitry of a crystal oscillator circuit that generates a reference signal with adjustable frequency may be partitioned in a variety of ways, for example, as one or more separate integrated circuits. The frequency modification circuitry may be implemented as part of a crystal oscillator circuit that includes digitally controlled crystal oscillator (“DCXO”) circuitry and a crystal. The frequency modification circuitry may include at least one variable capacitance device and may be employed to generate a reference signal with adjustable frequency. The adjustable reference signal may be provided to other components of the RF apparatus and/or the RF apparatus may be configured to provide the adjustable reference signal to baseband processor circuitry. Automatic frequency control (AFC) circuitry may be integrated with other components of RF circuitry and may generate frequency control signals for the frequency modification circuitry based on, for example, a signal received from a temperature sensor. Digital-to-analog converter (DAC) circuitry may be integrated with other components of RF circuitry to enable all-digital frequency control communications from baseband processor circuitry to RF circuitry.
216 Citations
24 Claims
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1. A radio-frequency (RF) apparatus comprising:
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one or more integrated circuits comprising integrated RF circuitry, said integrated RF circuitry including integrated digital-to-analog conversion (DAC) circuitry; and external frequency modification circuitry coupled to said integrated RF circuitry and comprising at least one variable capacitance device, said external frequency modification circuit being configured for coupling to a crystal to form a crystal oscillator circuit that is capable of generating an adjustable reference signal and of providing said adjustable reference signal to said integrated RF circuitry, said at least one variable capacitance device configured to adjust the frequency of said adjustable reference signal based at least in part on one or more analog frequency control signals received by said external frequency modification circuitry; wherein said integrated RF circuitry is configured for coupling to baseband processor circuitry, and wherein said integrated DAC circuitry is configured to receive one or more digital frequency control signals from said baseband processor circuitry and to generate and provide at least a portion of said one or more analog frequency control signals to said external frequency modification circuit based on said one or more digital frequency control signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio-frequency (RF) apparatus comprising:
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one or more integrated circuits comprising integrated RF circuitry, said integrated RF circuitry including integrated digital-to-analog conversion (DAC) circuitry; and digitally controlled crystal oscillator (DCXO) circuitry coupled to said integrated RF circuitry, said DCXO circuitry comprising frequency modification circuitry and amplifier circuitry and being configured for coupling to a crystal to form a crystal oscillator circuit that is capable of generating an adjustable reference signal and of providing said adjustable reference signal to said integrated RF circuitry, said frequency modification circuitry comprising at least one variable capacitance device, and said DCXO circuitry being configured to adjust the frequency of said adjustable reference signal based at least in part on one or more analog frequency control signals received by said DCXO circuitry; wherein said integrated RF circuitry is configured for coupling to baseband processor circuitry, and wherein said integrated DAC circuitry is configured to receive one or more digital frequency control signals from said baseband processor circuitry and to generate and provide at least a portion of said one or more analog frequency control signals to said DCXO circuitry based on said one or more digital frequency control signals; and wherein at least one or both of said amplifier and said frequency modification circuitry of said DCXO circuitry comprises external circuitry that is external to said integrated RF circuitry. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification