IPS - ESTS – DSI - Artigos científicos
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- Sensores de condutividadePublication . V. Dionísio, R.
- Sensores radioactivosPublication . V. Dionísio, R.
- Termómetros de semicondutoresPublication . V. Dionísio, R.
- Óptica geométrica: lei de Snell-DescartesPublication . V. Dionísio, R.
- Pressão estática e manómetro de coluna líquidaPublication . V. Dionísio, R.
- Sensores de velocidade angularPublication . V. Dionísio, R.
- Ponte de WheatstonePublication . V. Dionísio, R.
- Medição da viscosidadePublication . V. Dionísio, R.
- Digital to analog converter based on pulse-width addingPublication . Viegas, Vítor; Pereira, José Miguel Costa DiasThis paper presents a digital-to-analog converter (DAC) based on the pulse width created naturally by the binary counting sequence. The concept involves combining the counting impulses of the bits to form a pulse-width modulated signal, where the mean voltage is proportional to the input digital code. We propose a circuit capable of achieving this using general-purpose components. Although our design targets 8 bits, it is scalable for any number of nibbles. The paper details simulations conducted to verify the proper functioning of the circuit and to evaluate its performance. Tests were performed to determine the static characteristics of the converter, measure its differential nonlinearity (DNL), and observe its step response. In static terms, the converter exhibited negligible gain and offset errors, with a DNL below 1 LSB (least significant bit). The converter operated correctly without any missing codes. In dynamic terms, the converter demonstrated a bandwidth of 10 kHz and behaved like a second-order low-pass filter with critical damping.
- Editorial: IoT, UAV, BCI empowered deep learning models in precision agriculturePublication . Lian, Jian; Dias Pereira, José Miguel Costa