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US 2011/0254609 A1Published application
Vector modulator having attenuators with continuous input steering
AssigneeAnalog Devices, Inc.
InventorBarrie Gilbert
Life of this patent
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Abstract
Variable attenuation systems having continuous input steering may be used to implement vector or quadrature modulators and vector multipliers. Discrete implementations of attenuators with continuous input steering may have two outputs which may be cross-connected to provide four-quadrant operation. A symmetrically driven center tap may provide improved zero-point accuracy.
Claims5
A variable attenuation system comprising:
- a discrete attenuator having multiple inputs and two outputs;
- a steering core to continuously steer an input signal to the multiple inputs of the attenuator;
- a second discrete attenuator having multiple inputs and two outputs;
- and
- a second steering core to continuously steer a second input signal to the multiple inputs of the second attenuator.
2 more elements
A variable attenuation system comprising:
- an attenuator having multiple inputs and two outputs;
- a plurality of cascode transistors, each transistor having an output terminal coupled to a corresponding one of the attenuator inputs, a control terminal coupled to receive an interpolator signal, and an input terminal coupled to receive an input signal.
Dependencies are inferred from the claim text.