Qualcomm incorporated (20240106442). TUNING VOLTAGE TRACKER FOR RECEIVE/TRANSMIT PHASE-LOCKED LOOP (PLL) FAST SWITCHING simplified abstract

TUNING VOLTAGE TRACKER FOR RECEIVE/TRANSMIT PHASE-LOCKED LOOP (PLL) FAST SWITCHING

Organization Name

qualcomm incorporated

Inventor(s)

Jianjun Yu of San Diego CA (US)

Yue Chao of San Diego CA (US)

Tomas O'sullivan of San Diego CA (US)

Lai Kan Leung of San Marcos CA (US)

TUNING VOLTAGE TRACKER FOR RECEIVE/TRANSMIT PHASE-LOCKED LOOP (PLL) FAST SWITCHING - A simplified explanation of the abstract

This abstract first appeared for US patent application 20240106442 titled 'TUNING VOLTAGE TRACKER FOR RECEIVE/TRANSMIT PHASE-LOCKED LOOP (PLL) FAST SWITCHING

Simplified Explanation

The patent application describes methods and apparatus for storing a control voltage of a phased-locked loop (PLL) when switching from mission mode to standby mode and restoring the control voltage when switching back to mission mode.

• Example PLL circuit includes:

   - Charge pump
   - Voltage-controlled oscillator (VCO) with control input connected to charge pump output via a node
   - Tracking circuit connected to the node

• Tracking circuit samples node voltage during mission mode, saves representation of sampled voltage before entering standby mode, and restores sampled voltage to node when reentering mission mode using saved representation.

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1. 1. 1. Potential Applications

• Satellite communication systems
• Radar systems
• Wireless communication devices

1. 1. 1. Problems Solved

• Prevents loss of control voltage in PLL during mode switches
• Ensures PLL stability and accuracy in operation

1. 1. 1. Benefits

• Improved reliability of PLL circuits
• Seamless transition between mission and standby modes
• Enhanced performance of communication and radar systems

1. 1. 1. Potential Commercial Applications
         1. Optimizing Control Voltage Storage in PLL Circuits for Improved System Reliability

1. 1. 1. Possible Prior Art

No known prior art.

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1. 1. 1. Unanswered Questions

1. 1. 1. 1. How does the tracking circuit ensure accurate restoration of the control voltage in the PLL?

The tracking circuit utilizes the saved representation of the sampled voltage to precisely restore the control voltage to the node during reentry into mission mode.

1. 1. 1. 1. What are the potential implications of inaccurate control voltage restoration in a PLL circuit?

Inaccurate control voltage restoration can lead to instability in the PLL, causing performance issues in communication and radar systems.

Original Abstract Submitted

methods and apparatus for storing a control voltage of a phased-locked loop (pll) when switching from mission mode to standby mode for the pll, and for restoring the control voltage of the pll when switching back to mission mode. an example pll circuit includes a charge pump, a voltage-controlled oscillator (vco) having a control input coupled to an output of the charge pump via a node, and a tracking circuit coupled to the node. the tracking circuit is generally configured to sample a voltage of the node during a mission mode, save a representation of the sampled voltage before entering a standby mode, and restore the sampled voltage to the node for reentering the mission mode using the saved representation of the sampled voltage.