mirror of https://github.com/m-labs/artiq.git
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@ -287,6 +287,8 @@ class Channel:
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:param frequency: DDS frequency in Hz
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:param offset: IIR offset (negative setpoint) in units of full scale.
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For positive ADC voltages as setpoints, this should be negative.
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Due to rounding and representation as two's complement,
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``offset=1`` can not be represented while ``offset=-1`` can.
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:param phase: DDS phase in turns
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"""
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if self.servo_channel < 4:
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@ -310,9 +312,9 @@ class Channel:
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Where:
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* :math:`y_n` and :math:`y_{n-1}` are the current and previous
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filter outputs, clipped to :math:`[0, 1]`.
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filter outputs, clipped to :math:`[0, 1[`.
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* :math:`x_n` and :math:`x_{n-1}` are the current and previous
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filter inputs
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filter inputs in :math:`[-1, 1[`.
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* :math:`o` is the offset
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* :math:`a_0` is the normalization factor :math:`2^{11}`
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* :math:`a_1` is the feedback gain
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