Design and Analysis of Integrator-Based Log-Domain Filter by Gordon W. Roberts

By Gordon W. Roberts

This name bargains with the layout and research of log-domain filter out circuits. It describes synthesis tools for constructing bipolar or BiCMOS clear out circuits with cut-off frequencies starting from the low kilohertz variety to a number of hundred megahertz. various examples offer measured experimental information from IC prototypes.

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5% per [16]. When the device is driven by a certain this level of temperature dependency will make the resulting virtually unpredictable. As a result, one rarely sees bipolar devices driven in this manner in practice. Conversely, when the transistor is driven by to produce temperature dependence is now greatly reduced. 18) as the an exact and linear relationship between the logarithm of and is evident. When a couple of these devices are connected in a special manner to be demonstrated shortly, the resulting circuit can be made completely temperature independent.

Therefore, the related overhead in power consumption for linearizing the building blocks (say, the transconductors in filters) can be avoided [44]. Due to companding, the voltage swing inside the log-domain filter is very small. The impedance level along the signal path is thus typically low. Charging and discharging of capacitors will be fast. These characteristics make the log-domain filters suitable for very high-speed applications†. Several experimental results seem to agree with this argument [17], [42].

This divideand-conquer manner can help the log-domain filter field in general to mature at a faster pace. Circuit advancements can be brought to the log-domain integrators, resulting in high-speed, high-linearity, low-power log-domain filter realizations. Development in synthesis methods allows those building blocks to be put together systematically (or automatically, say, by CAD tools) for a versatile list of filter functions (such as Chebyshev, Elliptic, or even those with arbitrary filter shapes).

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