A method of determining Integral Non-Linearity (INL) of an Analog-to-Digital Converter (ADC) is provided. The method includes providing an input signal to the ADC, phase-locking a clock signal of a clock of the ADC to the input signal, generating a plurality of samples at a sampled phase on the input signal for a plurality of sampled phases, applying averaging to the plurality of samples for each sampled phase to generate a reconstructed ADC output signal, and determining the INL of the ADC based on a comparison of the reconstructed ADC output signal to a theoretical ADC output signal.

The present invention relates to nonlinear signal processing, and, in particular, to adaptive nonlinear filtering of real-, complex-, and vector-valued signals utilizing analog Nonlinear Differential Limiters (NDLs), and to adaptive real-time signal conditioning, processing, analysis, quantification, comparison, and control. More generally, this invention relates to methods, processes and apparatus for real-time measuring and analysis of variables, and to generic measurement systems and processes. This invention also relates to methods and corresponding apparatus for measuring which extend to different applications and provide results other than instantaneous values of variables. The invention further relates to post-processing analysis of measured variables and to statistical analysis. The NDL-based filtering method and apparatus enable improvements in the overall properties of electronic devices including, but not limited to, improvements in performance, reduction in size, weight, cost, and power consumption, and, in particular for wireless devices, NDLs enable improvements in spectrum usage efficiency.

An analog signal processing circuit comprising: a first promoter operably linked to a nucleic acid sequence encoding a first output molecule, wherein said promoter is responsive to a cooperative input signal comprising at least two cooperative inputs, and wherein expression of said at least two cooperative inputs is tunable.

A method and system of an analog to digital conversion having an exponential result are provided. An analog input signal is received by the ramp ADC. The analog input signal is converted into an N-bit digital signal having a linear relationship with the analog input signal. An internal gated clock signal is generated based on the received first clock signal. The gated clock signal is used as an input to an M-bit register. An output of the M-bit register is multiplied by a predetermined factor. The product of the multiplication is provided as an input to the M-bit register. The output of the M-bit register provides an M-bit output having an exponential relationship with the analog input signal.

A photonic compressive sampling system includes a photonic link with at least one electro-optic modulator that modulates a continuous wave optical energy with both an electrical analog signal and a pseudorandom bit sequence signal. A photodetector receives the modulated optical energy from the electro-optic modulator, and an electrical digitizer digitizes the output from the photodetector. The system enables signal recovery beyond the Nyquist limit of the digitizer. The signal being recovered has a sparse (low-dimensional) representation and the digitized samples are incoherent with this representation. An all-photonic system can faithfully recover a 1 GHz harmonic signal even when digitizing at 500 MS/s, well below the Nyquist rate.

The present invention relates to nonlinear signal processing, and, in particular, to adaptive nonlinear filtering of real-, complex-, and vector-valued signals utilizing analog Nonlinear Differential Limiters (NDLs), and to adaptive real-time signal conditioning, processing, analysis, quantification, comparison, and control. More generally, this invention relates to methods, processes and apparatus for real-time measuring and analysis of variables, and to generic measurement systems and processes. This invention also relates to methods and corresponding apparatus for measuring which extend to different applications and provide results other than instantaneous values of variables. The invention further relates to post-processing analysis of measured variables and to statistical analysis. The NDL-based filtering method and apparatus enable improvements in the overall properties of electronic devices including, but not limited to, improvements in performance, reduction in size, weight, cost, and power consumption, and, in particular for wireless devices, NDLs enable improvements in spectrum usage efficiency.

An apparatus for processing an undersampled digital input signal, comprises an input node configured to receive the undersampled digital input signal. A first circuitry is configured to perform a bandpass interpolation on the undersampled digital input signal to generate an interpolated digital signal using an interpolation factor depending on a Nyquist zone M selected from multiple Nyquist zones, M being greater than 1. A non-linear equalizer generates an equalized signal from the interpolated digital signal. A second circuitry is configured to downsample the equalized signal to a sample rate of the undersampled digital input signal.