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AssigneeIntegrated Device Technology, Inc.
InventorsFeng-Jung Huang, Jean-Marc Mourant
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Variable feedback architecture and control techniques for variable gain amplifiers (VGAs) concurrently maintain, across a wide range of VGA gain settings, minimal input and output impedance variations, a low noise figure, low rates of change in noise figure, high signal-to-noise ratio (SNR), high quality of service (QoS), low distortion, high and relatively constant output third order intercept point (i.e., IP3 or TOI). Variable feedback counteracts impedance variations caused by gain variations. Compared to conventional high performance VGAs, noise figure is lower (e.g. 3 dB lower at maximum gain and 12 dB lower at minimum gain) and relatively constant, IP3 is higher and relatively constant, small signal third order intermodulation signal (IM3) tone slope is relatively constant and input and output impedances are relatively constant. As gain decreases, the noise figure advantage is nearly dB per dB compared to conventional high performance VGAs.
A device comprising a variable gain amplifier having at least one variable feedback, wherein the at least one variable feedback comprises a plurality of variable components provided with coordinated control to concurrently control gain, compensate at least one of input and output impedance and maintain a 0.4 dB or less change in noise figure per 1 dB change in gain of the amplifier over an at least 5 dB range of gain of the amplifier.
A device comprising a variable gain amplifier having at least two variable feedbacks configured to provide at least one complementary control function and to provide concurrent control of gain, compensation of at least one of input and output impedance and maintenance of a 0.4 dB or less change in noise figure per 1 dB change in gain of the amplifier over an at least 5 dB range of gain of the amplifier.
A device comprising a controller configured to control at least two variable feedbacks in a variable gain amplifier to provide at least one complementary control function and to provide concurrent control of gain, compensation of at least one of input and output impedance and maintenance of a 0.4 dB or less change in noise figure per 1 dB change in gain of the amplifier over an at least 5 dB range of gain of the amplifier.
Dependencies are inferred from the claim text.