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Very wide range tunable CMOS/bipolar current mirrors with voltage clamped input

AuthorsSerrano-Gotarredona, Teresa ; Linares-Barranco, Bernabé ; Andreou, A. G.
Issue Date1999
PublisherInstitute of Electrical and Electronics Engineers
CitationIEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications 46(11): 1398-1407 (1999)
AbstractIn low power current mode signal processing circuits it is often necessary to use current mirrors to replicate and amplify/attenuate current signals and clamp the voltage of nodes with high parasitic capacitances so that the smallest currents do not introduce unacceptable delays. The use of tunable active-input current mirrors would meet both requirements. In conventional active-input current mirrors, stability compensation is required. Furthermore, once stabilized, the input current cannot be made arbitrarily small. In this paper we introduce two new active-input current mirrors that clamp their input node to a given voltage. One of them does not require compensation, while the other may under some circumstances. However, for both, the input current may take any value. The mirrors can operate with their transistors biased in strong inversion, weak inversion, or even as CMOS compatible lateral bipolar devices. If it is biased in weak inversion or as lateral bipolars, the current mirror gain can be tuned over a very wide range. According to the experimental measurements provided in this paper, the input current may spawn beyond nine decades and the current mirror gain can be tuned over 11 decades. As an application example, a sinusoidal gm-C-based VCO has been fabricated, whose oscillation frequency could be tuned for over seven decades, between 74 mHz and 1 MHz.
DescriptionEl pdf del artículo es la versión de autor.
Publisher version (URL)http://dx.doi.org/10.1109/81.802845
Identifiersdoi: 10.1109/81.802845
issn: 1057-7122
Appears in Collections:(IMSE-CNM) Artículos
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