A fast-tuned, injection locked, DDS-based local oscillator for the 3.6 to 4.1 GHz frequency range

A fast-tuned, injection locked, DDS-based local oscillator for the 3.6 to 4.1 GHz frequency range

A fast-tuned (100-n) synthesized local oscillator for the 3.6.4.1-GHz frequency range is described in which a direct digital synthesizer (DDS) is used to high-order subharmonically injection lock a voltage-controlled oscillator (VCO) and thereby upconvert and broaden the DDS frequency range. This is...

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Hauptverfasser: Cohen, L.D., Breuer, K.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Bandwidth
Frequency measurement
Frequency synthesizers
Injection-locked oscillators
Local oscillators
Microwave frequencies
Microwave measurements
Phase measurement
Time measurement
Voltage-controlled oscillators
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description A fast-tuned (100-n) synthesized local oscillator for the 3.6.4.1-GHz frequency range is described in which a direct digital synthesizer (DDS) is used to high-order subharmonically injection lock a voltage-controlled oscillator (VCO) and thereby upconvert and broaden the DDS frequency range. This is a design approach that combines the beneficial features of a DDS, namely its fine frequency resolution and fast switching speed, with the fast locking time (40 ns), in situ amplification, and high-order multiplication advantages that are intrinsic to subharmonic injection locking. A method is demonstrated that enhances, by a factor of 5, the narrow locking bandwidth normally associated with conventional subharmonic injection locking. A measurement of the locking transient and locking time of the injection process at a microwave frequency is reported. The measured 40-ns locking time is more than an order of magnitude faster than that of conventional phase locking.< >
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This is a design approach that combines the beneficial features of a DDS, namely its fine frequency resolution and fast switching speed, with the fast locking time (40 ns), in situ amplification, and high-order multiplication advantages that are intrinsic to subharmonic injection locking. A method is demonstrated that enhances, by a factor of 5, the narrow locking bandwidth normally associated with conventional subharmonic injection locking. A measurement of the locking transient and locking time of the injection process at a microwave frequency is reported. 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This is a design approach that combines the beneficial features of a DDS, namely its fine frequency resolution and fast switching speed, with the fast locking time (40 ns), in situ amplification, and high-order multiplication advantages that are intrinsic to subharmonic injection locking. A method is demonstrated that enhances, by a factor of 5, the narrow locking bandwidth normally associated with conventional subharmonic injection locking. A measurement of the locking transient and locking time of the injection process at a microwave frequency is reported. 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This is a design approach that combines the beneficial features of a DDS, namely its fine frequency resolution and fast switching speed, with the fast locking time (40 ns), in situ amplification, and high-order multiplication advantages that are intrinsic to subharmonic injection locking. A method is demonstrated that enhances, by a factor of 5, the narrow locking bandwidth normally associated with conventional subharmonic injection locking. A measurement of the locking transient and locking time of the injection process at a microwave frequency is reported. The measured 40-ns locking time is more than an order of magnitude faster than that of conventional phase locking.&lt; &gt;</abstract><pub>IEEE</pub><doi>10.1109/MWSYM.1993.276993</doi></addata></record>
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source IEEE Electronic Library (IEL) Conference Proceedings
subjects Bandwidth
Frequency measurement
Frequency synthesizers
Injection-locked oscillators
Local oscillators
Microwave frequencies
Microwave measurements
Phase measurement
Time measurement
Voltage-controlled oscillators
title A fast-tuned, injection locked, DDS-based local oscillator for the 3.6 to 4.1 GHz frequency range
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