摘要:
A variable-gain RF amplifier arrangement whose input impedance is essentially independent of the selected gain is proposed, which has a large number of selectable elementary amplifiers, with an input signal being scaled and the input impedance being set to be the same by means of switchable current limiting elements upstream of the elementary amplifiers, which are associated with the elementary amplifiers. The circuit also has a low noise level, which is largely independent of the selected gain, and good linearity. A broadcast radio receiver as well as a receiver for receiving data signals using an amplifier according to the invention are also proposed.
摘要:
A CMOS image sensor allows for selectively outputting one of two vertical resolutions, e.g. 1080 to 720 lines. The scan conversion is implemented completely on the image sensor chip by using smaller sub-pixel cores, which can be electrically combined via switch transistors. A basic circuit of the CMOS image sensor has a number of pixel cells arranged in lines and columns. Each pixel cell has a photosensitive element that converts impinging light into electric charge and a first transfer element. The first transfer elements of m pixel cells arranged consecutively in the same column are arranged for transferring the charge generated in the respective m photosensitive elements during exposure to a single first charge storage element provided for the respective group of m pixel cells. In an exemplary embodiment the switching scheme allows for combining the signal information of either two or three vertically adjacent sub-pixel cores.
摘要:
A circuit for resetting and reading out a pixel cell of a CMOS image sensor is proposed. The circuit allows for reading out the pixel cell at least two times during a main integration interval, thereby generating at least two pixel signals. The circuit further comprises means for combining the at least two pixel signals to an output signal. The means for combining are operable to combine the at least two pixel signals weighted in dependence on a saturation level of the pixel cell. A method for controlling the circuit for reading out the image sensor is also proposed.
摘要:
An image sensor circuit comprises a pixel cell array (1) having a plurality of pixel cells (8) arranged along a plurality of column lines (4o, 4e), a plurality of readout circuits (3e, 6e, 7; 3o, 6o, 7) connected to said column lines (4o, 4e), each of which comprises an analog-to-digital converter (7) and a multi- plexer (14; 19) for selectively applying an output signal of one of said column lines (4o, 4e) to said analog-to- digital converter (7). Between two of said column lines (41, 43,...) which are connected to a first one of said readout circuits (3o, 6o, 7) located at a first side of said pixel cell array (1), there is a column line (42, 44,...) which is connected to a second one (3e, 6e, 7) of said readout circuits located at a second side of said pixel cell array (1) opposite to said first side.
摘要:
A variable-gain RF amplifier arrangement whose input impedance is essentially independent of the selected gain is proposed, which has a large number of selectable elementary amplifiers, with an input signal being scaled and the input impedance being set to be the same by means of switchable current limiting elements upstream of the elementary amplifiers, which are associated with the elementary amplifiers. The circuit also has a low noise level, which is largely independent of the selected gain, and good linearity. A broadcast radio receiver as well as a receiver for receiving data signals using an amplifier according to the invention are also proposed.
摘要:
Image sensor, which comprises a plurality of pixels arranged as a pixel array with rows and columns and at least one read-out arrangement for reading out the pixels row by row. The columns are grouped into blocks (B1,...B64) with a certain number N of columns. Each read-out arrangement comprises N column read out circuits and an addressing circuit for with at least two groups of addressing lines for addressing the blocks. Each read-out arrangement is successively connected to one of the blocks of N columns. The blocks are selectively addressed by the groups of addressing lines in a way that a read-out sequence of blocks addressed by the groups is continuous across all blocks.
摘要:
An image sensor circuit comprises at least one pixel cell (1) for providing an output signal which is variable according to illumination of said pixel cell (1) between a maximum and a minimum level, an analogue-to-digital converter (2) for converting output signals from said pixel cell (1) into digital data, and an offset signal source for providing an offset signal (OFFSET BRIGHT, OFFSET DARK) having a level between said maximum and minimum levels. The analogue-to-digital converter (2) is fully differential and is connected to said pixel cell (1) and to said offset signal source.