A high-resolution DLL-based digital-to-time converter for DDS applications

A Digital-to-Time Converter (DTC) based on a Delay-Locked Loop (DLL) for phase interpolation in Direct Digital Synthesis (DDS) applications is described. The conversion is made in two steps using digitally controllable delay cells with configurable shunt-capacitors load. The circuit is able to inter...

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Bibliographic Details
Main Authors: Baronti, F., Fanucci, L., Lunardini, D., Roncella, R., Saletti, R.
Format: Conference Proceeding
Language:English
Subjects:
Applied sciences
Circuit properties
Circuit synthesis
Circuits of signal characteristics conditioning (including delay circuits)
Clocks
Communication switching
Delay effects
Digital control
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Energy consumption
Exact sciences and technology
Frequency
Interpolation
Phase locked loops
Read only memory
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Description
Summary:A Digital-to-Time Converter (DTC) based on a Delay-Locked Loop (DLL) for phase interpolation in Direct Digital Synthesis (DDS) applications is described. The conversion is made in two steps using digitally controllable delay cells with configurable shunt-capacitors load. The circuit is able to interpolate a 120 MHz clock, generating a delay proportional to an 8-bit digital control word with 32 ps resolution. The DDS system clock frequency is thus virtually enhanced up to about 30 GHz, achieving a strong reduction of the spurious component level. The 256 level interpolation is achieved using only 35 delay elements (excluding dummy cells).
DOI:10.1109/FREQ.2002.1075962