High linearity variable bit width interpolator

A high linearity and interpolator technology, applied in the direction of electrical components, automatic power control, etc., can solve the problems of no scalability, non-uniform phase change, poor reusability, etc., to achieve extended application range, uniform phase change, The effect of increasing linearity

CN101692608AInactive Publication Date: 2010-04-07IPGOAL MICROELECTRONICS (SICHUAN) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-04-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a high linearity variable bit width interpolator, comprising two input reference phases Ain and Bin, a phase control word PIN (0:X), and an interface of a bit width control word PIN_len. The bit width of the input reference phases is changed by the phase width control word PIN (0:X) to regulate the output phase precision of the interpolator. As the invention brings in the enable logic to an interpolation unit (MixerCell), the interpolation unit (MixerCell) can be divorced from a main circuit at any time in the working condition to realize the changeability of the bit width of the input phase control word and flexibly change the interpolation output precision. Meanwhile, a controllable switch corresponding to the input phase control word is introduced on a leakage path of the interpolation unit (MixerCell), therefore crosstalk caused by difference between proper time of two pairs of reference differential signals of input ends of the interpolator is modified, and then the linearity of the interpolation output result is greatly improved.
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Description

technical field

[0001] The invention relates to the field of integrated circuits, in particular to a high linearity-variable bit width interpolator. Background technique

[0002] High-linearity interpolators are widely used in data receiving-transmitting systems, such as data sampling, frequency jitter generation (including frequency ssc) and other functional modules. In the case of different digital configuration words, the linear interpolator generates uniform multi-phase clocks, and high-performance data receiving-transmitting systems require these clocks to have extremely high linearity and consistency.

[0003] The interpolator works as figure 1 As shown, the input Ain and Bin homologous clocks are obtained through different delays respectively, and the phase difference is Φ, which is expressed as a time delay tDelay. The interpolator also has a phase control word input: PH<0:X>, the input control word controls the output signal phase of the interpolation unit, ...

Examples

Embodiment Construction

[0033] Such as Figure 4 As shown, a high linearity-variable bit width interpolator has two input reference phases Ain, Bin and a phase control word PIN, and also has a bit width control word interface PIN_len, through the bit The width control word LEN changes the bit width of the input phase control word to adjust the output phase accuracy of the interpolator.

[0034] Phase control word (that is, interpolation control phasor / interpolation control word): a group of n (n>1) bit control phasors that control the relative positional relationship between the output phase of the interpolator and the input phase. For example: when the control word PH= (n bits), the interpolator output is the input signal Ain with a higher phase, and the control word PH= (n bits ) when the interpolator output is the input signal Bin with a later phase, and the control word PH changes from the minimum value to the maximum value , the interpolator output is changed from the front phase Ain Eve...