Techniques to reduce the effect of pad asymmetry and signal routing on resolution of PWM or PFM signals
AssigneeInfineon Technologies AG
InventorsSunanda Manjunath, Ketan Dewan, Juergen Schaefer
Life of this patent
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Abstract
Some examples relate to a system including a pulse modulation (PM) circuit having a PM input and a PM output. The system also includes a load circuit having a load circuit input, and an I/O pad coupling the PM output to the load circuit input. An asymmetry detection circuit has a first asymmetry detection (AD) input coupled to the PM output via a first feedback path, a second AD input coupled to an output node of the I/O pad via a second feedback path, and an AD output coupled to the PM input of the pulse modulation circuit via a control path.
Claims20
A system comprising:
- a pulse modulation circuit having a pulse modulation (PM) input and a PM output;
- a load circuit having a load circuit input;
- an I/O pad coupling the PM output to the load circuit input;
- and
- an asymmetry detection circuit having a first asymmetry detection (AD) input coupled to the PM output via a first feedback path, a second AD input coupled to an output node of the I/O pad via a second feedback path, and an AD output coupled to the PM input via a control path.
An integrated circuit comprising:
- a pulse modulation circuit having a pulse modulation (PM) output that is configured to provide a pulse width modulated (PWM) or pulse frequency modulated (PFM) signal;
- an I/O pad including an I/O pad input and an I/O pad output, the I/O pad input coupled to the PM output and the I/O pad output configured to provide a modified PWM or PFM signal to a load circuit, the modified PWM or PFM signal based on the PWM or PFM signal;
- and
- an asymmetry detection circuit having a first asymmetry detection (AD) input coupled to the PM output via a first feedback path, a second AD input coupled to I/O pad output via a second feedback path, and an AD output coupled to the pulse modulation circuit via a control path on which a control signal is provided to the pulse modulation circuit, the control signal being based on a difference between the first AD input and the second AD input and being operative to adjust the modified PWM or PFM signal.
A method, comprising:
- providing a PWM or PFM signal to an input of an I/O pad;
- providing a modified PWM or PFM signal from an output of the I/O pad, the modified PWM or PFM signal based on the PWM or PFM signal;
- and
- determining a control signal based on a difference between the PWM or PFM signal for one or more first clock cycles and the modified PWM or PFM signal for the one or more first clock cycles;
- and
- adjusting the PWM or PFM signal for consecutive clock cycles after the one or more first clock cycles, wherein the adjusting is based on the control signal.
Dependencies are inferred from the claim text.