Abstract
Analog dividers are widely used in analog systems. Analog realization of such circuits suffer from limited dynamic range and non-linearity issues, therefore, extra circuitry should be required to compensate these types of shortcomings. In this paper a gain controllable, analog divider is proposed based on data converters. Our circuit can be implemented both in current and voltage mode by selecting proper architectures. The resolution, power consumption and operation speed can be controlled by proper selecting of components. Another advantage of our circuit is its gain programmability. Moreover, the gain can be adjusted independently based on the relationship between input signals. Our proposed method offers two different gain control abilities, one for situation that the numerator signal is bigger than the denominator, and another gain is applied when the denominator is larger than the numerator. As a result, no extra amplifier is required for signal amplification. Moreover, the input and output signal nature can be chosen arbitrarily in this circuit, i.e. input signal may be a voltage signal while the output signal is current. Simulation results from SPICE confirm the proper operation of the circuit.
Highlights
Dividers are a basic building block in analog signal processing systems
Some researchers design dividers working in voltage mode, while current mode circuits can achieve lower power consumption, higher dynamic range and linearity
Using data conversers makes it possible to design a divider with wide dynamic range
Summary
Dividers are a basic building block in analog signal processing systems. Such a system usually requires high precision dividers to realize modulators, squarers, automatic level controllers, etc. Several techniques are proposed in the literature to design dividers in continuous time monolithic circuits from different technologies. CMOS dividers are reported both in the strong and weak inversion. Some researchers design dividers working in voltage mode, while current mode circuits can achieve lower power consumption, higher dynamic range and linearity. Authors in [15] proposed a novel method of realization of voltage mode analog multiplier/divider based on the modified cyclic data converter. A current mode multiplier/divider in current mode utilizing data converter techniques is presented in [7]. A novel divider circuit is proposed based on data converters. The gain of our proposed circuit can be adjusted independently in both conditions via a control signal and offers the maximum level of gain adjustability
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