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US 2013/0259103 A1Published application
Digital delta sigma modulator and applications thereof
AssigneeBroadcom Corporation
InventorHenrik T. Jensen
Life of this patent
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Abstract
A digital delta sigma modulator includes an input integration stage, a resonating stage, a quantizer, and a plurality of feedback paths operably coupled to the quantizer, the input integration stage, and the resonating stage. The input integration stage is operably coupled to integrate a digital input signal to produce an integrated digital signal, wherein the input integration stage has a pole at substantially zero Hertz. The resonating stage is operably coupled to resonate the integrated digital signal to produce a resonating digital signal, wherein the resonating stage has poles at a frequency above zero Hertz. The quantizer stage is operably coupled to produce a quantized signal from the resonating digital signal.
Claims20
A digital delta sigma modulator comprising:
- an input integration stage comprising a digital integrator operably coupled to integrate a digital input signal to produce an integration output and
- a first gain module (g1) operably coupled to adjust magnitude of the integration output to produce an integrated digital signal;
- a resonating stage operably coupled to resonate the integrated digital signal to produce a resonating digital signal comprising:
- a first integration stage operably coupled to integrate a first resonating digital signal to produce a first integrated resonating digital signal;
- a second gain stage (g2) operably coupled to adjust magnitude of the first resonating integrated digital signal to produce a second resonating digital signal;
- a second integration stage operably coupled to integrate the second resonating digital signal to produce the resonating digital signal;
- and a resonating feedback third gain module (g3) operably coupled to adjust magnitude of the resonating digital signal to produce a resonating feedback signal, and wherein a noise transfer function (NTF) of the resonating stage satisfies:
- NTF(z)∝(1−z−1)((1−z−1)2+g2g3z−2)
- ;
- and
- a quantizer stage operably coupled to produce a quantized signal from the resonating digital signal.
8 more elements
A fractional-N frequency synthesizer comprising:
- a phase and frequency detection module operably coupled to produce a difference signal from at least one of phase differences and frequency differences between a reference oscillation and a feedback oscillation;
- a charge pump operably coupled to convert the difference signal into a current signal;
- a loop filter operably coupled to convert the current signal into a control voltage;
- a voltage controlled oscillation module operably coupled to convert the control voltage into an output oscillation;
- a feedback module operably coupled to produce the feedback oscillation from the output oscillation, wherein the feedback module includes a multi-modulus divider module and a delta sigma control module, wherein the delta sigma control module includes:
- an input integration stage comprising a digital integrator operably coupled to integrate a digital input signal to produce an integration output and
- a first gain module (g1) operably coupled to adjust magnitude of the integration output to produce an integrated digital signal;
- a resonating stage operably coupled to resonate the integrated digital signal to produce a resonating digital signal comprising:
- a first integration stage operably coupled to integrate a first resonating digital signal to produce a first integrated resonating digital signal;
- a second gain stage (g2) operably coupled to adjust magnitude of the first resonating integrated digital signal to produce a second resonating digital signal;
- a second integration stage operably coupled to integrate the second resonating digital signal to produce the resonating digital signal;
- and a resonating feedback third gain module (g3) operably coupled to adjust magnitude of the resonating digital signal to produce a resonating feedback signal, and wherein a noise transfer function (NTF) of the resonating stage satisfies:
- NTF(z)∝(1−z−1)((1−z−1)2+g2g3z−2)
- ;
- and
- a quantizer stage operably coupled to produce a quantized signal from the resonating digital signal.
13 more elements
An integrated radio circuit comprising:
- a transmitter section operably coupled to convert outbound baseband signals into outbound radio frequency (RF) signals based on a transmit local oscillation;
- a receiver section operably coupled to convert inbound RF signals into inbound baseband signals based on a receive local oscillation;
- and
- a local oscillation generation module operably coupled to produce the transmit local oscillation and the receive local oscillation, wherein the local oscillation generation module includes:
- a phase and frequency detection module operably coupled to produce a difference signal from at least one of phase differences and frequency differences between a reference oscillation and a feedback oscillation;
- a charge pump operably coupled to convert the difference signal into a current signal;
- a loop filter operably coupled to convert the current signal into a control voltage;
- a voltage controlled oscillation module operably coupled to convert the control voltage into an output oscillation, wherein the transmit and receive local oscillations are derived from the output oscillation;
- a feedback module operably coupled to produce the feedback oscillation from the output oscillation, wherein the feedback module includes a multi-modulus divider module and a delta sigma control module, wherein the delta sigma control module includes:
- an input integration stage comprising a digital integrator operably coupled to integrate a digital input signal to produce an integration output and
- a first gain module (g1) operably coupled to adjust magnitude of the integration output to produce an integrated digital signal;
- a resonating stage operably coupled to resonate the integrated digital signal to produce a resonating digital signal comprising:
- a first integration stage operably coupled to integrate a first resonating digital signal to produce a first integrated resonating digital signal;
- a second gain stage (g2) operably coupled to adjust magnitude of the first resonating integrated digital signal to produce a second resonating digital signal;
- a second integration stage operably coupled to integrate the second resonating digital signal to produce the resonating digital signal;
- and a resonating feedback third gain module (g3) operably coupled to adjust magnitude of the resonating digital signal to produce a resonating feedback signal, and wherein a noise transfer function (NTF) of the resonating stage satisfies:
- NTF(z)∝(1−z−1)((1−z−1)2+g2g3z−2)
- ;
- and
- a quantizer stage operably coupled to produce a quantized signal from the resonating digital signal.
17 more elements
Dependencies are inferred from the claim text.