Integrator, resonator, and oversampling A/D converter
A technology of integrators and converters, applied in the field of integrators, can solve problems such as increased circuit scale, increased power consumption, and LSI performance barriers, and achieve the effects of high SN ratio, low power consumption, and high resolution
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no. 1 Embodiment approach
[0030] figure 1 The configuration of the integrator of the first embodiment is shown. The integrator 10 has an operational amplifier 11 , a filter 12 connected to the inverting input terminal of the operational amplifier 11 , and a filter 13 connected between the inverting input terminal and the output terminal of the operational amplifier 11 . The filter 12 is a secondary low-pass filter and includes: two resistive elements 121 connected in series; and a capacitive element 122 whose one end is connected to a connection point of these resistive elements and whose other end is grounded. The filter 13 is a secondary high-pass filter, and includes: two capacitive elements 131 connected in series; and a resistive element 132 whose one end is connected to a connection point of these capacitive elements and whose other end is grounded.
[0031] In the integrator 10, the input voltage is Vin, the output voltage is Vout, and the resistance value of the resistance element 121 is R 1 ...
no. 2 Embodiment approach
[0042] figure 2 The configuration of the integrator of the second embodiment is shown. The integrator 10 is equipped with the figure 1 The integrator 10 is configured differently from the filters 12,13. That is, the filter 12 is an n-order low-pass filter, and is provided with: three or more resistance elements 121 connected in series; The number of elements 122 is one less than the number of resistance elements 121 . The filter 13 is an n-order high-pass filter, and possesses: three or more capacitive elements 131 connected in series; The number is one less than the number of capacitive elements 131 .
[0043] Assuming that the number of resistive elements 121 and capacitive elements 131 is n, the transfer function of the integrator 10 can generally be expressed by the following formula. Among them, α, β, γ, τ, and κ are constants determined by respective element values of the resistance elements 121 , 132 and the capacitance elements 122 , 131 .
[0044] (Formula 4)...
no. 3 Embodiment approach
[0049] image 3 The configuration of the integrator of the third embodiment is shown. The integrator 10 is in figure 1 or figure 2 A filter 14 is added on the basis of the integrator 10. The filter 14 includes a resistive element 141 and a capacitive element 142 connected in parallel to the filter 12 . Filter 14 acts as a feed-forward path between the input of integrator 10 and the inverting input of operational amplifier 11 . As a result, 0-order, 1st-order, and 2-order integral components are generated on the output of the integrator 10 in addition to the n-order integral components. Each integral component can be adjusted by appropriately setting the resistance element 141 and the capacitance element 142 .
[0050] In addition, one of the resistive element 141 and the capacitive element 142 may be omitted. For example, when the filter 14 is constituted only by the resistive element 141 , the output of the integrator 10 is made to generate a first-order integral compo...
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